jet needle clip position The needle jet and jet needle work together to control the fuel flow between the 1/8 thru 3/4 range. Just find the right size allen key and loosen the little screw holding the arm just enough so you can move it to the left off of the eclip. 6:1. Push the jet needle out of the diaphragm and find the clip attached to the notches; it will be near the top of the needle. A needle that is set in a clip position that is too lean will also cause hesitation or Clip Position 3RD Air Screw 1 out Main Jet 172 1999 Pilot Jet 50 Needle STOCK Clip Position 2ND Air Screw 1 out Main Jet 168-170 1997 Pilot Jet 48 Needle STOCK Clip Position 3RD Air Screw 1. As the throttle valve Clip Position opening is increased, the tapered jet needle is raised Main Jet #130: Pilot Jet/Slow Jet #45: Jet Needle Clip Position: 3rd Groove: Pilot Screw Adjustment: 2 5/8 turns out: Float Level: 18. If you use the OEM needle, place 1 (approx. The ‘E’-Clip can be raised or lowered on the Jet Needle. The most popular jetting kit for the stock carb is Dynamometer repair The most complete kit is Procycle's stock carb jet kit. Note positioning of needle and seat attachment clip to the float, you will want to re-position the new needle clip in the same manner when you re-install the float assembly. The needle I removed has the E-clip in the #4 position. 04 inch) Pilot screw setting 2. Main jet - one size up or down doesn't seem to have a real big impact on power, smoothness, or spark plug readings. With the engine fully warmed up ride at a steady 50 mph in 5th gear on flat ground. ok question, i found my needleclip position and there r 5 setting. High numbers = rich. Needle letter denotes mixture below half-throttle. 2. Starting jetting for TM34 on my stg2 RD400's with VF YZ85 reeds, aftermarket intake manifolds, pipes, porting, uni foam filters, using my TSR/Barlow designed boost bottle: 310 main Q0 needle jet 42. Place the shim provided by SLP under the eclip/over the stock plastic washer and drop the jet needle back down. The clips are referred to in numerical order with the bottom position being #5, the Richest (refer to attached jetting chart illustration). NOTE: The power jet only works when the engine is revving flat. Low numbers = lean. The opposite is true for a lean condition. Replace existing jet needle with this part. Cover the clip with a finger from one hand and press the needle down with a finger from the other hand. When we tuned our Mikuni we tried about ten different main jets, five pilot jets and every clip position on the needle jet. The needles usually have 3 to 5 clip settings, the uppermost giving the leanest and the lowest the richest mixture. Pilot jet: 50. Replace existing main jet with this part. 5: 110: 110 / 120: Needle Jet: X-2: X-2: X-2: Jet Needle: 5GZ6: 5GL16: 5GL16 Using either the manufacturer's or the jet kit's recommended pilot screw setting as a starting point, turn the fuel screw left or right between 1/4 and 1/2 of a turn. 1,2,3,4,5,6,7 are progressively richer. Correction Factor. 5) Needle: Lift the needle to richen (move the clip towards the pointed end), lower the needle to lean the engine out (move the clip away from the pointed end). 5 mm (0. 1991 Kawasaki ZXR 750 needle jet clip position I have a ZXR750R (K Model) with Flatslide carbs (They have VFD on the side of them, and the manual states they are type CVK-D39's). Clip position = 3rd Air screw setting =around 21/2 turns Slide = What comes with powerkit. Model "E" Clip Position EC34-2PM02 50P7-2 EC44-3PM02 6FJ6-3 EC45PL09 60H7-2 EC45PL08 6DH3-3 EC50PM03 6DH7-3 EC50PM04 60H7-3 EC50PM05 6DH7-2 EC50PM06 6DH7-3 EC50PL16 6EJ26-3 EC50PL17 6F9-3 EC50PL19 6EJ26-3 EC50PL20 6EJ26-2 EC58PL03 6DP17-3 EC58PL07 6EJ3-2 EC58PL08 6DH7-3 EC58PL09 60P17-3 EC58PL12 60H7-3 EC59PL01 6CEY6-4 EC68PL01 6DH8-2 EC68PL03 6CEY6-4 SN70LCDCSP-01 R1370G-3 SN70LCDCSP-02 R1370J-3 EC80PL04 6CGY6-3 EC80PL05 6CGY6-3 Do not pay too much attention to the low-end richness when you are changing needle clip positions - you still need to be using the clip position that produces the best full throttle / 5k-7k power in conjunction with the main jets (Step 1) that produce the best power at high rpm. so in short; yes the main jet and needle position DO have a minute affect on the idle circuit's jetting mix, but it is very The top end of the needle has grooves cut in it and you can move the little clip on the end up or down to lean (down) or richen (up) the mixture. As you raise the needle, or go from the top clip to the bottom clip position, you Richen the needle. Power jet: 50 Needle: N3EW Clip position: 2nd from top Air screw: 3/4 turns out (1 turn stock) Notes: For 2011 the YZ250 compression ratio was reduced from 10. Place needle clip in mid-position. cut-away. 0mm #92. Jet Needle. On most needles there are 5 clip positions. 5 pilot jet, needle clip in the center position and air screw two turns out (stock position). Hopefully this may help anyone else with a similar build . Lowering the clip richens the needle setting. Jet needle E-clip position incorrect. 5 on the pilot jets but dynojet uses a different #'s on the jets. com/fiddymil/Facebook: https://www. '04 - '07 Canada. Save Share NEEDLE CLIP POSITION (JET NEEDLE) You will usually end up in stock position or one position richer or leaner. Performance just off-idle is cleaner and more immediate. 090 thousands. When you unscrew the top of the carb, you will see a rubber diaphram with a slide and a needle pointed down into the body of the carb. 5 with the clip in the bottom slot, and essentially a 116. Needle Clip P/N R963-500 The main jet is now beginning its operation but fuel is metered through the main jet by the jet needle's profile and position within the slide (or valve) this is known as the "clip position" referring to the retaining clip on the needle. 91 to . Moving the clip down raises the needle causing a richer mix. The opposite holds true for a richer mixture. Needle 5N13. Plugs B9HS. Final settings on the carb for above build is 50 acc pump jet, standard 97 needle with clip in stock position (centre groove) 165 main jet on main jet extender and idle mixture screw set at 2 1/4 turns out. By varying the height of the needle in relation to throttle opening, the amount of taper of the needle in the main nozzle will change the fuel mixture. On the other hand, I have a second carb from a parts bike that has a P6 needle jet and larger jet needle (the factory is a P4). Carb was delivered with 185 main jet installed, 45 pilot, JD Blue needle in 4th position from top, air screw 2 turns out. This is most often the case on more recently manufactured scooters trying to conform with EPA (Environmental Protection Agency) regulations. Jet HAssortment Kit for HSR Jet Assortment Kits contain 44 pieces in a special jet box. Needle: 6DH3. The needle sits down in the middle of the slide and rests on the clip. (which are difficult to obtain with the 640ADV) I have found it difficult to select the "right" main jet. How does WOT feel over 5K? Does it pull or does it feel weak? What MODS done? 1. A positioning clip at the top of the needle suspends the needle from the bottom of the slide. Bogging: Again, not a technical term but commonly used. The needle can be positioned to hang lower by moving the clip on the needle to a higher notch. The needle jet should be snugged in place by the needle jet holder. Jet Needle: Lower numbers indicate smaller jet size or opening. Power jet: 50. 0-31. (which are difficult to obtain with the 640ADV) I have found it difficult to select the "right" main jet. position (in the middle) My needles: 2. 1/4-3/4 throttle opening: Adjustments that are in operation. 2. Select best needle clip position To get the best power at full throttle / 5k-7k rpm, after you have already selected the best main jet, If the engine pulls better on a full throttle roll-on starting at <3k, when cool but soft when at full operating temperature, it is too rich in the midrange and the needle should be lowered. A perfectly tuned 2-stroke engine/carburetor delivers a 12. 1. Upon further investigation, I found my E-clip split into two with only one piece in the slide. Does this pin simply locate the position of the needle jet, or, does it somehow fix the jet in place? I hope it is to position the jet so I can then tap the jet out and do my but I'm running the jet needle with the clip in the #1 (top) position. The Kit for 2018 is also changed as KTM altered the needle jet inside the carb, so JD compensated again. com/FIDDYmil/With the idle mixture tuned, the second and final step is to change The needle jet works in conjunction with the jet needle. If needle is not adjustable try shimming it with a small washer, Mikuni washer or Keihin washer. If you copy our setup you may or may not see great results. Stock 28mm Carbs. 5-1 Needle Clip: This is the small circular clip that is used to adjust the needle position. " This can be very confusing as raising the clip position actually lowers the needle in the slide. Slide: 2. Remove the tank, seat and side panels. The stock main jet (#148 for 87 to 07, #145 for the 08) often works well. K&N Y-boot air filter. Needle Clip: This is the small circular clip that is used to adjust the needle position. Needle Jet 175 0-8 (stock) Pilot jet 27. If the calibration is rich, lower the JET NEEDLE with a longer (L1). my recommendatino if you are in the states, 155 main jet, open top airbox, 6F19 needle on 4th clip (one clip richer than stock), pilot screw adjusted as per my page on adjusting the pilot screw (start with 2 turns out before adjusting). facebook. Where I have my bike set now is 170 Main Jet needle stock clip 4th position Pilot jet 50 MSR Pilot screw 1. Based on throttle position fuel id delivered from different circuits within the carb. Position 1 is the leanest position. 5 main jet, and/or using the #3 clip position. If the motor runs best with the clip in the bottom notch, the needle taper is too shallow or the needle jet is too small. Raising the needle richens the mixture and lowering it weakens the mixture at throttle openings from quarter to three quarters open ( see Fig 5. 5 out Main Jet 178 1999 Pilot Jet 42 Needle STOCK Clip Position 2ND Air Screw 1. The higher the clip position, the lower the needle sits in the main jet and the less fuel that NEEDLE CLIP POSITION - Its effect is mostly up to 3/8 slide open (40% throttle open) and should not be used to adjust 3/4 throttle position because that should be adjusted with needle taper. Needle Clip P/N R963-500 A tapered section follows the straight area and ends with a sharp tip that rests in the main jet. Try the needle in the lower position, viz, with the clip in the groove at the top. Then lower the needle (raise the clip) one more position. 3. Rochester Quadrajet Needle & Seat Assemblies. Primary Choke: 3/4-4/4: Richer Verify what the stock main jet is supposed to be. Suggested jetting for aftermarket exhaust and stock airbox: 140 Main Jet, 22. These are very rough numbers and there is some overlap. As the clip lowers on the needle, the needle raises in the needle jet. These washers will raise the jet needle taper, richening the low RPM fuel mixture. Condition: Motor running and main jet out. The slide cutaway and the needle DIAMETER are very similar in their actual effect on jetting. • Removing the airbox snorkel may require a #142. im thinking its rich and i also want to bump my main jet up to atleast a 260 from a 250. So, the lower the clip, the more it opens up and the higher the clip the less it opens. When I say jetting I mean everything, pilot jet, main jet, needle and clip position, fuel screw and position, leak jet or accelerator pump cover if you changed them. Tri Spark EI, K&N RC-0850 Air Filter , straight through pea shooters. In the closed throttle position, the tapered needle shuts off flow from the needle jet. Needle or needle jet is correct: Carburetor should run clean to approximately 3/4 throttle. As far as the oversize pilot air jet, I bought the ATV this way and unfortunately, I don't have the 120 jet that it calls for from factory. 025 thick. The wider the root diameter, the smaller the space between the needle and the hole in the needle jet. Look at these 3 graphs for a single taper needle showing too little, just right, too much slide height at taper beginning. The jet needle is a tapered cylinder that looks a lot like a sewing needle. First needle number denotes mixture above half-throttle. If the clip position is too lean the engine will sound quiet and have a “dead” feeling possibly hesitating. Standard reference is 1 is always at the top. once your main jet is selected you will need to move onto your needle clip position. 5 & 2 turns out . Raising the needle by lowering the "E" clip position at the top of the needle will richen the mixture. This leaves the pilot jet size and the pilot screw for the idle and low throttle conditions. That's your needle jet. I came back and checked my plug, it didn;t really change colors, it was still pretty white, telling me it was too lean. Pilot Jet: 35. Im still leaning twards a carb problem here though. which way on the needle is to lean it out. At the upper end of this range the main plays a part too, but you have already selected the main jet. The air jets – 1/2 to full-open throttle The jet needle – 1/4 to 1/2 throttle. This affects the air/fuel ratio around quarter to three-quarter throttle. Main Jet 220 The position that makes it run best between 1/4 and 3/4 throttle - experiment, grasshopper. 5 pilot jet, needle clip in the center position and air screw two turns out (stock position). If you cut the carbuterot in half and could see the needle as it is raised out of the needle jet, you would see the straight part of the needle does not clear the needle jet's orifice until about 1/3rd throttle (varies with which position the needle clip is in). I thought i would add my jetting on here. Slow Jet (pilot jet): '02: #45 '03: #42 Main Jet: '02: #175 '03: #170 Jet Needle: '02: OBEKR '03: OBELR Jet Needle Clip Position: '02: 4th position '03: 5th position Special Circumstances - Main Jet: 1. as the needle sits in the carb move the clip down towards the ground . 7 V minimum: Primary Coil Peak Voltage: 100 V minimum 18 Before inserting the float hinge pin bring the float/needle assembly down into the position. Not on a stock CV carb. 0 out Main Jet 170 1999 Pilot Jet 52 Needle STOCK Clip Position 2ND Air Screw 1. Install the needle clip on the jet needle. air screw 1. European models (clip position) 5DH29-54 (3) US and Canada models 5DH30-54; Needle jet P-0; Main jet. 5 out Main Jet 165 1998 Pilot Jet 48 Needle STOCK Clip Position 3RD Air Trying to grasp the needle-clip position relationship between two Main Jet sizes. The needle jets are set up as follows; 1 and 4 at the fourth clip from the top, 2 and 3 at the sixth clip from the top. Hope this helps Jet Needle/Clip Position: Pilot Jet: Throttle Valve Cutaway: H1 w/o CDI : Mikuni VM28SC: 23. From 1/2 to 3/4 throttle if you are running too rich, move the clip on the needle down a notch. 9 mm (0. Unless you're a race mechanic the only thing you'll play with is the position of the needle clip on the needle. Also see the Jet Needle diagram which explains the needle clip position effect on fuel delivery, as well as the position of the needle at various throttle Pilot Jet 42-48 Needle R1173N Clip Position 3RD Air Screw 1. Its tapered lower part fits into a brass sleeve located below the slide in the bottom of the air passage: This is the needle jet (NJ). this is affected not only by the idle speed control (because that controls the level that the slide/butterfly bottoms out at), but also by the taper and level that the needle is set at and also the size of the main jet. From there you should be able to remove the needle and put the clip in the correct position. it is in the middle on 3 should i go down or up and by 1 or 2. The thicker the needle the leaner the mixture. The clip position determines how deep it sits in the hole. The Jet Needle has five notches and a C-clip which determines the position of the needle in the slide based on which notch the clip is placed in. The needle position determines how high the needle sits in the throttle slide. FUEL SYSTEM/CARBURETION During low speed driving, there is very little clearance between the jet needle and the needle jet; therefore, General Carburetor Representation very little fuel from the main jet can pass between the jet needle and the needle jet. This is often referred to the "clip position. All US models use a 6F23 fixed clip position jet needle and a Y-5M needle jet. These data are calculated depending on the weather conditions and the engine configuration introduced in the other tabs. 5 turns out, constantly adjusted by eighths of a turn to suit seasonal and daily air density fluctuations. Needle Clip 3rd position (from top) When you unscrew the top of the carb, you will see a rubber diaphram with a slide and a needle pointed down into the body of the carb. 25 out Main Jet 168 1997 Pilot Jet 55 Needle STOCK Clip Position 3RD Air Screw 1. Jet Needle Jet Needle Clip Position Airbox Inlet Duct Caps (Air intake restrictors) Honda P/N 18317-MBN-640 16211-MBN-640 99101-357-1750 16012-MBN-641 N/A N/A Instructions Replace existing spark arrestor with this part. Loosen the carburetor clamps and rotate the TM40 to the right. The thinner the taper the richer the mixture. 3. Slide at 1/2 Throttle: At 1/2 throttle the fuel metering is clearly being done by the needle’s taper. 1991 Kawasaki ZXR 750 needle jet clip position I have a ZXR750R (K Model) with Flatslide carbs (They have VFD on the side of them, and the manual states they are type CVK-D39's). Without a baseline of what you have changed it wil be hard for us to help you, the more info you give us the better we can help. From there you should be able to 3. Air Jet: 2. 5 turns out; 1998-2006 600. Length of the straight section - This determines at which point the needle taper will start relative to the clip position. Needle letter denotes mixture below half-throttle. Length of the straight section - This determines at which point the needle taper will start relative to the clip position. 5 Pilot Jet, Needle Clip in 2nd position from top. Pilot Jet 27. 5. Jump to Latest Follow 1 - 3 of 3 Posts. With a performance pipe/expansion chamber, the air box lid removed and the stock or a performance silencer run a 45/48 pilot, R1173N jet needle in the mid clip position, a 152/155 main opening. Adjust E-clip to factory specification. In mechanical slide carbs like the stock CRF50 carb the needle-jet/ jet-needle combination controls from about 1/4 to 3/4 throttle then the main jet takes over at 3/4 to wide open throttle once the needle is out of the way. 5 out Main Jet 380 2002 Pilot Jet 32. The needle jets are set up as follows; 1 and 4 at the fourth clip from the top, 2 and 3 at the sixth clip from the top. Bring the bike up to temp & adjust the air screw very slowly until you hear the tick over increase , I would imagine it to be nearer the 2 turn mark. Main jet 172,pilot 38,needle positon 3. Needle Jet: P-8: Jet Needle: 5J9-3 - last number is the clip position where 1 is at the top of the needle (leanest) and 5 is at the bottom (richest) Throttle valve (slide) 2. The two nozzle needles D49 and D53 differ significantly in the change of the needle diameter, the D53 is much steeper. Readjust the idle speed to the correct level. 1/4 to 3/4 THROTTLE: The JET NEEDLE is the most effective component in this range. Main Jet: 280. Now follows roll-on testing, conducted with the machine standing still, engine running. From that point until the main jet takes over near 3⁄4 throttle, the jet needle taper is the main control of mixture strength. A positioning clip at the top of the needle suspends the needle from the bottom of the slide. Pilot Jet 22. 5 to 150 range. That said, how was the setting arrived at?It's the pilot air jet (offset to the right when the carburetor is upright and being viewed from the inlet side) that's the larger of the two. 0mm #90 Reverse: 194 #O-2 #5EH7-3rd #30 #2. Consequences: 1. That is also the jet you need to change. The lock nut is only there to keep it from backing out from main jet removals--not for allowing up/down adjustment of the needle jet holder and needle jet. Pilot Jet: This is second jet in your carb. The Jet Needle is the long narrow needle in the center of the throttle slide valve. Searching for the other half, I was sly enough to remove the reed cage before firing the bike up again and found the other half sitting in the corner of The bigger the needle, the earlier the mix is enriched. 035 in) Pulse Generator Peak Voltage: 0. They might adjust the air screw, adjust the jet needle’s clip position or exchanging the pilot (slow) jet, main jet, throttle valve (slide) or jet needle for one of an appropriate size. Adjust the jet clip based on your motorcycle’s needs. 0 What If The Jet Needle Only Has One Clip Position? While most needles have 3-5 grooves that allow the needle clip to be moved for tuning purposes, some only have 1 groove. I also have a 170 and 165 main jet in my tool box as well. The clip/length setting covers the largest percentage of jetting in your carburetor. 5, needle 6F19 clip on 3rd slot (Australian, Canadian and UK needle). The needle jet controls the mixture from 1/8 to 3/4 throttle. If the calibration is lean from 1/4 to 3/4 throttle, raise the JET NEEDLE by lowering clip position, or use JET NEEDLE with shorter length (L1). Removal & Installation: Remove airhorn casting from main body casting. 25 if the clip is in the middle? The position of the Mikuni ‘E’-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. Needle position. The needle clip indicates the position at which the clip is placed on the jet needle counted from the top position. Needle Clip P/N R963-500 Use the clip position on the jet needle. ) affects idle and up to 1/3 throttle. Repeat the test. Needle letter denotes mixture below half-throttle. 5 out Main Jet 320 1988 Pilot Jet 48 Needle STOCK Clip Position 3RD Air Screw 1. What i would check is to make sure the choke isnt partially stuck open or has the cable improperly adjusted. Needle Clip Position: Top notch, but might be compensating for too large a main jet somewhat. Standard on the Mikuni BST 40SS carb is; main 140, pilot 42. Just to add some closure. Inspect hose for kinks. . Main Jet 140 (stock) Needle clip position as needed. I suspect now that my fouling problems were the result of both pistions being a little past the wear limit - not too surpsising @ 14,000 km!! The pistons may well have been the originals - they were stamped "Made In Austria". Raising the needle by lowering the "E" clip position at the top of the needle will richen the mixture. You will deal with the low-end / cruise next. It is suspended from the bottom of the throttle slide and held in place by the slide return spring and spring plate. I had a very rich condition and replaced the stock needle and and jet from stock to a Vance and Hines stage one. If mixture is lean at 1/4 throttle and rich at 3/4 throttle, change to smaller taper. The top clip position is referred to as #1 and is the Leanest setting. Be careful that reduction of the pilot jet does not require an increase in needle jet as these do create an overlap. It may also need the needle circlip in the #3 or 4 position. Instagram: https://www. The idle mixture screw on a BST33 carburetor is a fuel screw. JL Expansion Chambers. If your needle jet is missing or worn CVP carries new needle jets. Raising it richens it up. carbs 1 and 4 115 So to summarise in the range ¼ to ¾ throttle opening for the Rotax classes, your main adjustment is the needle clip position - clip1 being the weakest setting and clip 5 being the richest setting. Of course it isn't perfectly like that and there is some feed between that but that is the theory of them. You can make the needle hang higher by moving the clip on the needle to a lower notch. pag 7). This Is the correct and simple way to change Jet needle e clip positions. Initially, there was a hesitation off the bottom, most noticeably after the engine warmed up. Lowering the needle (Raising clip position) leans out the mixture while raising it (lower clip position) will do the opposite. 6 +/-1 mm (0. The throttle slide – 1/8 to 1/2 throttle The brass needle tower – 1/2 to full throttle. com is dedicated to the Honda CB750 SOHC and DOHC motorcycles and to their owners who love to ride, restore, and customize them. Thus small changes to the needle jet makes a big difference in how the bike will run. All was fine, I put in the 260 jet like FMF suggested, changed the plug, and took her for 4 minute wide open cruise. Hold the clip/needle against a hard surface with the open end of the clip pointing down. It is worth to mention that one should always keep in mind that the open end of the needle clip of a TecumsehPower carburetor would always face out towards the air cleaner side. needle jet = DQ262 K23 needle (clip in middle position, top = leaner) main = 150 pilot = 40 The pilot jets range from 35 to 100 in one size increments. Altitude 0-5000' 5000' & Above Pilot jet 35 30 Needle jet 166 Q-2 166 Q-0 JET NEEDLE (1/4 - 3/4 THROTTLE) The tapered portion of the jet needle rises out of the needle jet at about 1⁄4 throttle. On most needles there are 5 clip positions. 5 out 1989 kx500 main jet: 175 pilot jet: 62 needle: stock clip position: 3rd air screw: 1. Jet needle height: Next we have the height of the jet needle itself. STANDARD POSITION: 2rd groove from top AhBf '05 USA, Aher '07 CAn¥18. bike studders on low throttle and bogs out til atleast 3/4 to wot. . Moving the holding clip to the top notch (position #1) will delay the timing between the jet needle and needle jet clearance versus the air intake supplied by the opening of the throttle valve. 00. The jet needle size is N1AL i'm not sure if that's stock or not the clymers doesn't give a stock spec for the jet needle. The ‘E’-Clip can be raised or lowered on the Jet Needle. e. If the tip of the needle is hanging higher, it allows more fuel through the needle jet, and makes the fuel-air mixture richer. The taper needle position in relation to the throttle valve can be set according to the mixture required by repositioning the jet needle clip in any of three positions thus raising or lowering it. 0mm: 29. The needle can be seen when the throttle is opened. As a rule of thumb, you should use a smaller diameter atomizer if the needle is in the lowest setting (clip in highest slot), while you should use a larger diameter atomizer when the need-le is in the highest setting (circlip in lowest position). The lower the needle, the less fuel that gets buy at this point. If the engine is too rich above a quarter throttle raising the needle clip (#1 in illus. Lowering the needle will lean the mixture. Included are 2 ea. See the Chart Below for reference to see how each throttle position leads to fuel delivery overlap. If the motor runs best with the clip in the top notch, the needle taper is too sharp or the needle jet is too large. ) will lean the mixture. Clip Position: 2. Up to 1/4 throttle position on large Kaw fours produces a surprisingly brisk road speed. H. 03 and above: Raise needle 1 clip position However, on balance, my best 932 combination is 230 main, 106 needle jet, 2 ring long needle, chamfered spray tube, 3½ slide and for what its worth, a 25 pilot jet, with the tiny starting circuit hole and its by-pass hole kept scrupulously free from blockages. 5 out Main Jet STOCK 1987 Pilot Jet STOCK Needle STOCK Clip Position 3RD Air Screw 1. Position refers to which slot the clip is inserted on, it's counted from the top down. Remove the main jet. It is held in place in the center of the throttle slide by a V-shaped clip. Standard jetting as delivered: Main Jet 150. KHS-025 HSR42 Jet Kit with box , 44 piece assortment. In addition, this tab lets to make a fine tuning adjustment to adapt to a concrete engine and Position Description VM14-8340 1 Dust Cover: Cable Adjuster 30BIC/84 2 Cable Adjuster M21/14 3 Locknut: Cable Adjuster B20/247 4 Carburettor Top VM17/200 6 Spring: Throttle Return VM14/151 7 Retaining Plate: Jet Needle VM14a/38 8 E Clip: Jet Needle MD14/40 9 Jet Needle #Variable 10 Throttle Valve VM12/101-size 11 Needle Jet VM12-95-size 12 Dust Cover: Cold… Read More » And though the overall jets are much leaner in numbers compared to stock jets, the needles make up for it. Start tuning by lowering the needle (raise the clip) one position and test ride. 7 in) Engine Idle: 1400 RPM: Ignition; Ignition Type: CDI: Spark Plug: DPR7EA-9 (NGK) X22EPR-U9 (Denso) Spark Plug Gap Max: 0. This MOUNT TYPE Spigot MAIN JET 4/042-Size 200 TICKOVER POSITION Left PILOT JET VM22/210-Size 35 COLD START POSITION Left NEEDLE JET VM34/05 (159) Q-6 COLD START TYPE Lever JET NEEDLE 6DP17 Clip groove #3 AIR SCREW POSITION Right STARTER JET Fixed — FLANGE PITCH (MM) — PILOT AIR JET — — CLAMP DIA (MM) — PILOT… Read More » KartMAX PRO is a must for teams, professionals, engine tuners and club racers. Needle Jet 175-P-6. Standard Carb Settings / m=main / p=pilot / c-=needle clip position: 135m/40p : Stock, 149cc: 135m/40p--Pipe and 149cc (basic jet specs) 140m/42p--Pipe and 149cc (* send stock carb out for tuning/Carb Mods for optimum performance)--- CRF230F: OEM Carb : Honda : Standard Carb Settings / m=main / p=pilot / c-=needle clip position: 102m/42p The needle and needle clip position controls the mixture from 1/4 to 1/2 throttle. Make sure the air screw is set at 1. Next I adjusting the Idle and Pilot Air screws out with no change and finally screwed them both in till seated - no change, bike stills starts quick and runs at fast rpms. Position Part Number Description 1 N/A Carburettor Body: Front 2 VM18/341 E-clip: Jet Needle( TM36-31) 2a TM32/90 E-Clip: Jet Needle (TM40-6) 3 VM26/315 Washer: Jet Needle( TM36-31) 3a 826-03002 Washer: Jet Needle (TM40-6) 4 739-13001 Screw 5 C5=0514 Screw: Throttle Valve Lifting Arm 6 TM36/39 Gasket: Carb Top 7 TM36/59 Carburettor Top 8 TM36/57 Lifting… Read More » For air: For fuel: The air screw – closed to 1/8 throttle The pilot/slow jet – Closed to 1/4 throttle. (or what ever the instructions say) Make sure you adjust the fuel/air by pass screw as stated in the instructions, then you will have to adjust your idol. The bottom needle clip position is the richest position available. . The needle can be seen when the throttle is opened. hi there i have an 02 wr250 with a barrett slip on. This 06’ YZ250F came stock with a OBELQ needle with clip in 3rd position. As a guest you can view the forum and photo galleries, but you have to register before you can post or view attachments. The manual lists six needles, ranging from richer to leaner, but no info. on how much change you get from needle to needle. . Step 3: Jet Needle Clip Position and Needle Selection. Needle and jet changes can be done without removing the carburetor from the bike. Kurykyn hyper charger and Vance and Hines slash exhaust, baffles in. The Jet Needle is the long narrow needle in the center of the throttle slide valve. instagram. The stranger part is the shim/spacer under the clip on the old needle is just . There is a clip and five little grooves that move the Jet Needle up (richer) or down (leaner) in the Needle Jet. 2. This is also a part that you do not want to get mixed up. • A less restrictive exhaust system, and/or air box mods, may need a main jet in the #142. 95: Lower needle 1 clip position: 1. Main jet obstructed. I want to put in a leaner needle so I can drop the clip and get a little more room for adjustment for summer and elevations. It appears the needle jet is a press fit into the carb body and off to one side I can easily see what appears to be a small brass pin which goes into the side of the jet. 10. Suggested jetting for stock exhaust and stock airbox: 135 Main Jet, 22. Lowering the clip position on the needle will raise the needle in the jet. Needles stock: 3. Needle Jet: P2. main jet than the above chart. If mixture is lean at 1/4 throttle and rich at 3/4 throttle, change to smaller taper. And a huge thanks to all those who contributed. Our testing resulted in this final setup: 130 main jet, 12. Remove the main jet. Cant help you out with the dynojet numbers on the jets but definetly raise the pilot jet one size, and if the jetkit dosent come with new needles maybe look into getting some aftermarket ones. Moving the clip up lowers the needle causing a leaner mix. Try stock setting first and adjust as necessary. Note how readily the engine maintains that steady speed without small throttle changes from you. Start motor and run it on the stand. Go richer on the main jet, by one number, when the track has a very long straightaway, steep climbs, a high percentage of sand, or the track is muddy. heyketz · Registered. Thoroughly clean the inside of the float bowl prior to reinstalling it. com The clip was on the third groove down. I think it does, some, anyway; obviously a smaller and smaller effect at wider open throttle positions. Replace with a larger main jet. The purpose of this tool is to recommend jet, needle clip position and spark plug reference, taking in consideration the weather conditions on the racetrack for different engine/carburetor configurations. 5 out Main Jet 165-168 1996 Pilot Jet 52-55 Needle STOCK Clip Position 3RD Air Screw 1. preece@swansea. Raising the needle richens the mixture and lowering it weakens the mixture at throttle openings from one quarter to three-quarters open. 5 Pilot Jet, Needle in top position. Bad news is that many newer bikes have only one clip position. Jet Needle: Lower numbers indicate smaller jet size or opening. Needle position 4th groove from the top. I just installed my FMF exhaust. The Jet Needle has fi ve notches and a C-clip which determines the position of the needle in the slide based on which notch Selecting jet needle clip position. Similarly one may ask, what does raising the needle jet do? 1/4 to 3/4 THROTTLE: The JET NEEDLE is the most effective component in this range. First needle number denotes mixture above half-throttle. 9:1 to 10. 5 Reverse: 172 #O-4/8mm #5DJ19-4th #30 #2. Main Jet controls the fuel mixture from 60% to 100% open throttle. Main Jet, Jet needle. 2. Need help identifying your main jet? Go to Identify that jet. Do I have a 115 when the clip is in the top slot, and a 117. 0mm: 29. 5 turns out Leak jet 72 The problem I am having with the bike. If I raise the clip on the needle, it will be at its highest position. First needle number denotes mixture above half-throttle. From 3/4 throttle to full throttle, the motor should start to break up as a result of too rich condition. Moving the clip down raises the needle and moving the clip up lowers the needle. Discussion Starter • #1 • Aug 5 Jet Needle: Lower numbers indicate smaller jet size or opening. Select best needle clip position To get the best power at full throttle / 5k-7k rpm, adjust the needle height, after you have already selected the best main jet. As the slide is opened fuel makes its way past the taper of the needle. The 08’ needle is a dual taper that claims more bottom to mid performance. The top was rich, so i need smaller jets. In 2008, they changed the needle to a NFPR with clip in 5th position. 5 out Main Jet 178 2000 Pilot Jet 45 Needle STOCK Clip Position 3RD Air Screw 1. haven´t checked number. 5mm over (64. '01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, K&N '01 Polaris Scrambler 400, '04 Suzuki LTZ400 The top needle clip position is the leanest position available. I've moved the clip up to the 1st position leanest. Needle clip - one position up or down has a very noticable impact. Boxed zone altitude should drop jet needle one position (raise E clip). Changing to a needle with a longer or shorter L1 measurement effectively lowers or raises the jet needle in the needle jet. The settings are so specific that there is an included washer that will raise the needle a half-clip position if needed in the setting. Feb 1998 D. Nylon plate goes into piston on top. The tiny washer is more than likely a shim that you use to raise the needle further, if need be. When you let off your throttle, the needle lowers into the main jet circuit, cutting off fuel flow as it goes down. It is suspended from the bottom of the throttle slide and held in place by the slide return spring and spring plate. When the needle comes up out of the Needle Jet, it allows more fuel to enter. big difference. Fit the smaller idle jet and adjust the mixture screw for best idle. Step 1 (Best Main Jet) must be selected before starting step 2! Select best needle clip position; To get the best power at full throttle / 2500-3500 rpm, adjust the needle height, after you have already selected the best main jet. If the calibration is rich, lower the JET NEEDLE with a longer (L1). With that elevation all i can say is buy a dyno jet kit and try diferant main jets but 1st try moving the clipup or down that aint to hard and u WILL notice if ur making it worse or better. uk) on NOC-L 20th. 3. There is an "e-clip" at the top of the jet needle with 5 height positions. 5, needle 6F19 clip on 3rd slot (Australian, Canadian and UK needle) US models use a 6F23 fixed clip position jet needle and a Y-5M needle jet Mikuni TM40 Starter jet 37. Paul Preece (p. The clip is easily removed by pulling it off the needle with some pliers and then relocated to another slot. Pilot screws are preset from the factory and should only be adjusted under necessary circumstances. Jet Needle clip position 3/5 Schwimmerstand in mm Float level in mm 22±2. Plug color will be even on each cylinder when correct. If a twin carb setup check the sync of the carbs. High numbers = rich. I had the clip on the second position but never checked the plugs, it ran crappy then too. Look on SLP's web site to see which position to put your clip. Lowering the needle into the carb leans the afr. The needle jet works in conjunction with the jet needle. and as far as main jets go im running 205 but the bike will only run with big jets if u can get big air into the bike,but thats another task down the road for u change the clip position and see what happens Adjusting the needle jet size, jet needle, and needle clip position will affect the mid range operation. Air screw: 3/4 turns out (1 turn stock) Notes: For 2011 the YZ250 compression ratio was reduced from 10. The top end of the Jet Needle has grooves cut in it, usually five, and you can move the little clip up (which moves the Jet Needle down in relation to the Throttle Valve and Needle Jet) to lean the mixture or down (moving the Jet Needle up in relation to the Throttle Valve and Needle Jet) to richen the mixture. ” Moving the clip up will lower the needle, making it leaner. Clip Position 3RD Air Screw 2. The main jet –1/2 to full-open throttle. The main jet feeds the needle emulsion tube. Type BSR32SS; Pilot jet 12. That's your needle jet. Main jet 148-150 Air screw between 1. Place the jet needle into the slide, making sure the washers remain in place. The top slot is position 1 and is the leanest clip position (less gas), the bottom slot is the richest clip position. KHS-045 HSR45 Jet Kit with box , 44 piece assortment. if you have a low range or mid stumble (like yer running out of gas) then move the clip down 1 notch . The position of the ‘E’-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. The jet needle is a long tapered rod that controls how much fuel can drawn into the carburetor venturi. There are four parts of the carb that are normally adjusted to get the fuel/air mix to the correct values for maximum engine performance: pilot jet, fuel screw, needle clip, and main jet. Remove airhorn/bowl cover gasket. 5 out Main Jet 152-158 1990 Pilot Jet 42-48 Needle R1173N Clip Position 3RD Air Screw 1. Y'all ride hard n free. Warm starting and normal running are good, but like others the on/off enricher makes the transition from cold starting to normal idle a bit hit or miss. I ordered a Sigma Race Jet Kit . From 3/4 throttle to full throttle, the motor should start to break up as a result of too rich condition. Clear obstruction. 48, 46 is stock) The middle area (needle) were perfect. The main jet controls the mixture from 1/2 to full throttle. High numbers = rich. 5mm cutaway: Pilot Jet 20. Needle clip - one position up or down has a very noticable impact. Needle Jet Clip Position and Needle Size The needle jet controls the mixture from ¼ to ¾ throttle. Pilot Jet 40 Needle 38-70 Clip Position 1ST Air Screw 1. Jet Needle Clip Position 92 Tdm - posted in All About TDM: What is the factory setting for the jet needle clip position? Currently mine is set at 2nd groove from the bottom with a plastic spacer and steel washer. Condition: Motor running and main jet out. The needle jet and the needle serve to control a proper air-fuel mixture ratio during the so-called medium throttle valve opening (between 1/4 and 3/4 opening). Engine Jet Needle No. Select the screw position where the engine speed increase is the greatest. I cleaned and rebuilt the carb, and put the stock airbox back on, with the needle clip on the middle position (I'm pretty sure that's stock). At idle and just above idle the thick parallel part of the needle sits in the needle jet , so moving the needle up or down makes no difference at small openings, but increasing or decreasing the needle jet size will make a difference. The needle also has various clip positions, with which it is possible to determine its position. Sir, you Address 1930 Carpenter RD SE Lacey, WA 98503-2915 United States of America Phone: 360-350-0557 Email: tech@jdjetting. Fit the leaner needle with the clip in the middle notch. The first test concerns slide cut-away. On four strokes, we ride almost 90% of the time "on the needle", meaning that we ride with the throttle open to the position where jetting is controlled Below is picture of both old and new stock needles - the profiles appear to be the same -- and by putting the clip into the center position, you will match the position of the older 1 slot needles. If you are getting hesitation under acceleration, and your ignition timing and main jet are in the right range, than raising the jet needle is usually the first adjustment to make. The needle is tapered so when the it is 1/4 to 3/4 of the way out, the angle of taper is what determines how much gas can escape through your main jet. 717". The top clip position is referred to as #1 and is the Leanest setting. 57 +/- 0. Needle jet obstructed. 1976 RD400. Press firmly, and the clip will slide off the top of the needle. With Mikuni jet sizes you would be around the 150 155 range on the mains and 25 to 27. Thousands of users all over the world are using our software. main jet: 175 pilot jet: 62 needle: stock clip position: 3rd air screw: 1. : 3) Clogged idle mixture circuit. This was achieved by I recommend installing a 5CD27 needle with the clip in the 4th to 5th position from the top. from the top (needles one noth up, to richen it up) The test showed that it was lean in the lover area, so I need a bigger idle jet. US 79(SF) US 80(SG) US 80(SH) Type: BS34-II 3H3-00: BS34-III 3J6-00: BS34-III 3J6-00: Main Jet: 137. Air/fuel screw is out 3 turns. 50mm) Freash rebuild. (lean needle but rich clip Stock -Run the stock R1172N jet needle in the second from the top clip position, 48 pilot jet, 155 main jet and fine-tune the pilot circuit using the air screw. Clip Position: 1/8-3/4: Richer: Clip position is counted from top down. Joined Apr 28, 2010 · 8 Posts . 8-0. as a rule of thumb i usually start with the clip in the middle positions, and doing a plug chop can remove the need to test every clip position. The jet needle is a tapered cylinder that looks a lot like a sewing needle. 5 out 1991 kx500: main jet: 168 pilot jet: 58 needle: n82m clip position: 3rd air screw: 1 I had already dropped the needle one clip position. Slide, needle, needle jet and needle clip: the slide controls air flow and the others meter the fuel. 5-2 Slide = 7 Conclusions/Results = I'm going to start out at Kelly's settings and go from there. 0-25. of a wide range of Main Jets, Pilot Jets, Needles, A/P Nozzles, Needle Clips, Needle Washers. Standard Carb Settings / m=main / p=pilot / c-=needle clip position: 135m/40p Stock, 149cc: 135m/40p--Pipe and 149cc (basic jet specs) 140m/42p--Pipe and 149cc (* send stock carb out for tuning/Carb Mods for optimum performance)--- CRF230F: OEM Carb Honda Standard Carb Settings / m=main / p=pilot / c-=needle clip position: 102m/42p Stock, 223cc Thats the jet needle youre talking about, the needle jet is the brass tube in the carb that the needle slides up and down in. 5 out Main Jet 170-172 1996 Pilot Jet 45 Needle STOCK Clip Position 3RD Air Screw 1. The clip/length setting covers the largest percentage of jetting in your carburetor. 4TH NEEDLE with throttle in position 4. Conclusions/Results =i just changed my needle from DEY15-74 that i use on the ice to the GAY one for road use as it´s a little leaner in the middle. 0-31. The higher the clip snaps into place on the needle, the deeper it is immersed in the mixer tube and the leaner the mix is in the half throttle range. This Is the correct and simple way to change Jet needle e clip positions. the new one in the kit is . The Mikuni CV carburetor can be tuned via 3 methods, the main jet that controls fuel flow during full acceleration, the needle clip position that controls fuel flow during cruising and roll on throttle, and the mixture screws that regulate fuel flow during idle conditions. Cylinders . An E-clip sets the position, and that position is often referred to as “the clip. Changed the pilot jet from 58 to a 48 air screw 2 turns out 160 main jet DGH needle clip one notch up from center position Number on the side of my carb 72RA4 NCQ Notes: bottom end always has been real fat just trying to clean it up some, 48 made a good improvement, think I will stick with it, I also swapped needles with the wifes Pilot (get needle has 5 notches. If the calibration is lean from 1/4 to 3/4 throttle, raise the JET NEEDLE by lowering clip position, or use JET NEEDLE with shorter length (L1). The plate has a semi-loose fit, the piston barrel guides it straight, but it can slide up and down freely (meaning the needle can also slide up). The clips are referred to in numerical order with the bottom position being #5, the Richest. That is, if I go one Jet Needle Adjustment In many applications operation has improved with the jet needle raised by lowering the position of the clip at least one notch. The jet needle regulates fuel by its taper, diameter, and clip position. The needle jet is where the jet needle slides into. To richen the fuel mixture the ‘E’-Clip is lowered on the Jet Needle, raising the Jet Needle. With all Amal carburettors the clip position is top down. Clear blockage. Slow running cd1atomiser (fitted as std. German full power Y, K1, and K2 (00-02) models 115; All other models. Q: Are your parts suitable for modern fuel? A: Yes all Amal products are suitable for use with modern fuel. The jet needle sits in a hole in the needle jet, as mentioned. Low numbers = lean. I also have 2 mini washers sitting on top of the needle clip, should I remove those? I think the dealer put them on, they installed the dynojet kit. I've left the stock main jets in. That comes with Main jets (178,172,168) Pilot jet 50. The Jet Needle rides in the throttle slide. 5 out Main Jet 168-170 1998 Pilot Jet 52 Needle STOCK Clip Position - Results: in this tab, the recommended main jet, needle type and clip position, pilot jet and air screw position are shown. Fuel flows through the space between the needle jet and jet needle, which space is unvarying until the throttle reaches the 1/4 open point. Place needle clip in mid-position. Pilot Jet: … typically has no effect beyond approximately 1/4 throttle. Power jet: 50 Needle: N3EW Clip position: 3rd from top Air screw: 1-1/2 turns out (1 stock) Notes: If you switch to an aftermarket pipe, you might need to go up one on the mainjet. Needle clip position CB750. needle clip position: this works in conjunction with the length of the straight section. This will produce a leaner 1/4 to 3/4 throttle opening, because there will be more air passing into the engine than fuel allowed. Needle type and clip position can be changed based on atmospheric conditions. Starting at the top 1= leanest and 5= Richest. 0: Needle Jet: O-8: Jet Needle: 5J9-2 (last opening. Clip is in the 3rd position and put in the 132 jet. 0-25. 5. 5 turns out +/- 1/4 turn. During your 2-stroke carb adjustment, pay close attention to the needle. Slide at Full Throttle: At full throttle the tip of the needle is clear of the Needle Jet orifice. this will raise the needle up a little and allow for more fuel at any given throttle position Various needles have 1, 3, 5, and 7 clip positions. If the engine jerks under load and there is no spitting either the jet needle is too high or a larger cut-away is required to cure the richness. Push the jet needle up from inside the carb, careful not to lose the stock plastic washer. HVCcycle Performance Heads. If the position of best idle is less than 1/2 turn open, the idle or pilot jet is too small. 5 Needle STOCK Clip Position 3RD Air Screw 1. Replace existing carb insulator with this part. Clip position: 2nd from top. Needle: N3EW. Half-size needle shims are available through Thunder Products to adjust your needle 1/2 of a clip position at a time for precise tuning. Im not sure anymore what they used but I think it was a 224/aa4 you'll need to step that up a size or 2 and then put your needle clip back in the #3 position. Q: Needle Clip position, top down or bottom up? A: Something that crops up all the time is whether you count the needle clip slot from the top down or bottom up. 0: Air Screw setting: 1 1/2 turns out: 28mm (VM28SC) Late Z1-A & all Z1-B: Main Jet: 112. Fuel flow from the needle jet is controlled by the tapered Jet needle taper and position in the needle jet (plus slide cutaway) governs air/fuel mixture from 1/4~3/4 throttle. A good place to start would be to get all the carb settings back to the stock point and see how the bike runs = pilot jet, main jet, needle clip position, and air screw settings. If the clip is lowered, the jet needle is raised and the mixture will be richer. Main jet too small. 5 pilot needle clip on 4 or 5 position 1 - 1/2 air screw Chuck Pilot Jet: 45 Main Jet: 165 Needle: NCYS Needle Clip Position: 3 Fuel Screw Type: WORKS CONNECTION Fuel Screw Setting: 2 1/4 AP Modified: NO Leak Jet: 40 AP Cover: STOCK Exhaust Type: STOCK Exhaust Modified: REMOVED DIFFUSER Pink Wire Modified: YES Cam: HOTCAMS STAGE 1 powernow & powernow plus runs perfect Hi Matthew, i have a 98 Kawasaki Vulcan 1500 classic. This is because the idle jet is more correct and the pump delivers fuel sooner but at a lower rate than stock. needle is set too rich you will hear a sputtering like the choke is on and the acceleration will be slow. This is because the needle is sitting farther down the inside of the atomizer or emulsion tube, restricting the fuel flow for a longer period of throttle slide travel. 5 turns out. It is held in place in the center of the throttle slide by a V-shaped clip. The root diameter, on the otherhand, is the diameter of the needle at it’s pointy end. See Chart at top of box for proper jet sizes and needle slot/clip position. 6:1. Since they cleaned my carbs it runs like crap at 1/4 throttle. 2009 KTM 250SXF JETTING Main: 175 Pilot: 40 Needle: OBEKP Leak jet: 50. Float chamber vent hose (TM-style) obstructed, kinked or damaged. 5 out 1990 kx500 main jet: 170 pilot jet: 62 needle: n82l clip position: 2nd air screw: 1. Inside the CV carburetor there are a series of tiny passages connecting the mixture screw, pilot jet, and air intake jet located on the front face of the carburetor (pictured below). The 4-stroke needle jet allows the main jet to sit further in the bowl while the 2stroke needle jet hold does not. 5 ; Jet needle. The stock needle is designed to support the stock R and simply moving the clip to the 4th or 5th position (stock is 3rd) is not optimum and you may experience a bog or improper jetting All I can say is: USE THE REVISED NEEDLE WHEREVER YOU GET IT, THIS IS IMPORTANT ! NEEDLE/JET KIT - Yamaha XV650 V-Star 650 1998-2010 8. If you’re running rich, move the clip up one rung toward the top of the needle. Clip position: 5th from top Fuel screw: 1-1/4 turns out (1 stock) Notes: KTM switched from an OBETP needle in 2008 to a richer OBEKP for this year and added a leak jet. 50. Pilot jet = 45 Needle = JD Blue Clip position = 3rd (middle) Air screw setting = 1. If your jetting is rich from 1/4 to 3/4 throttle you can either lower the needle byraising the clip position or go to a needle with a longer L1 measurement. ac. Main jet - one size up or down doesn't seem to have a real big impact on power, smoothness, or spark plug readings. Depending upon which In the TM34's, they come with no air jet and is how I do run them. All it does is allows a smaller main jet to be used which weakens off low down carburation. 5: Air Jet: 1. im Vergaser Rebuild-Kit enthalten included in the rebuild kit nicht im Kit enthalten, ggf Upon doing so, I was greeted with the needle sitting in the jet block not attached to the slide. 031-0. From what you have stated I get the impression it could be cause of your issue. 9:1 to 10. E-Clip position on jet needle. 9. Start motor and run it on the stand. Riders looking for more fuel economy can move the needle clip up a position without losing much performance Also pulled carb back out and changed the jet needle to the Shindy needle set to the 1st clip position - didn't change the rpms - still over reving. The pilot jet governs air fuel mixture from idle~1/4 throttle. 90 and below: Lower needle 2 clip positions from stock setting. 5: H1 w/CDI Jet Needle - this controls the fuel when you open and close the throttle (between 20 and 80 percent power) Needle Jet - this is what the jet needle pops in and out of (between 15 to 60 percent of throttle _____ Main jet tuning: perfect air fuel ratio is 12. 812" long while the 2-stroke needle jet comes in at 0. I never did play with the jets, although I have them here if I want to. Much smaller than the Main Jet and typically has no effect beyond approximately 1/4 throttle. 5 out Main Jet 172 1997 Pilot Jet 55 Needle just beginning to leave the needle jet (as adjusted by the needle clip position). Needle or needle jet is correct: Carburetor should run clean to approximately 3/4 throttle. Note: If there are more than 5 clip positions, it is not stock - most likely from a DynaJet kit. The 4-stroke Amal needle jet measures . Our testing resulted in this final setup: 130 main jet, 12. By going to a thinner needle, there is a larger area between the jet needle and the needle jet supplying a richer mixture. Depending on the inside diameter of the needle jet, it will affect the jet needle. Pilot Jet: 40 Air Screw: Around 1. 5. Its better to jet on the rich side. 050" or 1/16" thick) of the small brass washers over the long end of the needle jet (Slide Detail 3). Remove the OEM Main Jet and Pilot Jet, and replace them with the appropriate Main and Pilot Jets as specified. When there are no clip positions on the needle, you The needle seats into the needle jet and regulates the air-fuel mixture from the jet to the carb throat. Refer to download repair manual. Main Jet Size/Type: NeedleJet/Primary choke height: Jet Needle/Clip Position: Pilot Jet: Throttle Valve Cutaway: H1D/E: KA6: Mikuni VM28SC: 23. Be careful the clip doesn't go flying off. By going to a thinner needle, there is a larger area between the jet needle and the needle jet supplying a richer mixture. If the best position is as much as three turns open, the jet is to big. Regardless of what size jet needle you have, the tuning will still be the same for this portion. The top groove or 1st position on the needle would be P1. Needle goes into piston with retaining clip on the middle of 5 clip grooves. If the engine pulls better or is smoother at full throttle/5k-7k in a full throttle roll-on starting at <3k when cool but soft and/or rough when at full operating temperature, it is The taper needle position in relation to the throttle valve can be set according to the mixture required by repositioning the jet needle clip in any of three positions thus raising or lowering it. The 3rd clip position if the designed needle position for the needle diameter & taper, as well as length it is the normal clip position for the needle as a jetting starting point. 2. 5 out Main Jet 152-158 1989 Pilot “Lowering the needle” by “raising” the clip up one position makes the the gas flow leaner in the low to mid throttle range. 3. The Jet Needle has fi ve notches and a C-clip which determines the position of the needle in the slide based on which notch 1/4 to 3/4 throttle, needle jet (atomiser) needle position and taper of needle. If you’re in Australia, all the same except needle on 3rd clip. retest with a larger size. The top is fixed to the center of the throttle valve by the needle clip, and the tapered end extends into the needle jet. Main jet If the setting is alright up to ¾ of the throttle opening, you can finally select the 90 F+ ---- 93 main jet needle clip P3 / 36 pilot NOTE: P3 refers to the position of the jet needle clip in the 3rd groove. Also make sure the e-clip on the needle is in the correct position. (no. At least for the newer DR650 the jet configuration on the Mikuni BST 40SS carb is as follows: main 140, pilot 42. Needle Jet Holders Needle jet holders are fairly simple to identify. 3/4 to full throttle, main jet and power jet if used. I called FMF but they When we tuned our Mikuni we tried about ten different main jets, five pilot jets and every clip position on the needle jet. wen bike was studdering plugs were dark so im assuming rich. 5 to 1 air to fuel ratio. Jet Needles Come in lots of different sizes but the real beauty of the Jet Needle is it's adjustability. 5; Float height 14. Jet Needle Position. Low numbers = lean. jet needle clip position