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 Mikuni Needle Jet Removal

Mikuni Needle Jet Removal

Page 1 of 5 - Placing shim under needle - posted in REV Chassis - Performance and Trail Models: A few Dootalkers asked how to add a shim to the needles, to help with the lean condition on the Gen III 800 motors. If you want more fuel for the or better throttle response from the CV install the DynoJet kit for $75. Page 92 FUEL AND LUBRICATION SYSTEM Remove the needle valve retainer and needle valve. Genuine Mikuni OEM TMX-X Flat Slide 914 Series Size S9 Needle Jet 784-410002-S9 See more like this Mikuni 007. Clip position/ Removal. CARBURETOR FINE TUNING GUIDE by Harry & Gerhard Klemm / GroupK. Home / Parts / Mikuni BN Needle & Seat Replacement Sea-Doo. With help of Haynes manual have disassembled but the inlet needle valve seat does not come out of the upper body. Check them for "oblong" wear - the needle jet orifice starts out round!. Remove pilot air jet it is not used for this application If using a vacuum operated fuel petcock like the OEM one found on the DRZ S or SM, you will need to install a vacuum nipple in the manifold. txt) or view presentation slides online. Disconnect any vacuum hoses and the fuel hose from the stock carburetor. although i've got to do a few plug chops and have a look at the state of play i can feel at all throttle positions that she's about right. 5 needle valve can flow the maximum amount of fuel that the Super BN can pump, so the only reason to use a larger needle valve is to obtain the correct needle valve and arm spring combination (pop-off) for your watercraft. The jet needle is set at the middle clip height, per recommendations. Step 1: DETERMINE THE CORRECT NEEDLE AND OR NEEDLE JET. Whether or not your carburetor is a MIKUNI or a KEIHIN, it does not matter. Sometimes the needle jet will have an O-ring. My Yamaha TW200 is a model year 2006 North America spec machine. Example: Kawasaki AR50s came equipped with mikuni large round jets. Then, carefully. Reassemble in reverse order and road test for result, Note: Jet needle changes of one notch affect main jet size by 10%, therefore, after adjusting jet needle, recheck main jet operation for rich or lean condition. 6 (Below) Remove the four. See bottom of page to order the needle. Mikuni HSR48 carburetor rebuild kit. CARBURETOR FINE TUNING GUIDE by Harry & Gerhard Klemm / GroupK. Mikuni Pilot Jets BS30/96 - OEM; Mikuni Pilot Jets VM22/210; Mikuni Pilot Jets VM22/210 - OEM; Mikuni Pilot Jets VM28/486 - OEM; Needles And Seats. Float needle only Mikuni style. There may also be some. K: P-0 so here's my guide on how to clean your Mikuni BST36SS carburetors a. 75-3 right carb Needle settings: Factory needle settings ~Brian. Don't attempt this at home. Push it down to seal the hole as you spray carb cleaner. Remove the pilot jet, main jet, and needle jet holder. I think all the needle jets in this forum list what appears to be the 2 stroke type. We are still very much expanding our parts offerings for these carburettors so please contact us by email if the part that you are looking for is not yet listed. A slot runs through the center of each jet, which makes the jets look like a standard screw. Raising or lowering the jet needle has no effect on fuel mileage below about 70 mph. Then use the old rubber stoppers to do this. Ive put the needle back to the original position now, 2nd clip from top. Mikuni Hitachi Teikei S&S First identify the carb manufacturer, mikuni, keihin, hitachi, holley. 2-stroke Mikuni carb on a 4-stroke. Check them for "oblong. My Yamaha TW200 is a model year 2006 North America spec machine. If you would like to mess with the stock hawk 250 carb, I have the images posted at the bottom of this blog post. Mikuni Pilot Jets BS30/96 - OEM; Mikuni Pilot Jets VM22/210; Mikuni Pilot Jets VM22/210 - OEM; Mikuni Pilot Jets VM28/486 - OEM; Needles And Seats. In fact you will have to order the #40 Mikuni pilot jet separately, it does not come in the kit. My ride is an '86 MaximX 700 with Mikuni carbs. I ran this on a stock motor with Mikuni carb boots (with vacuum barbs blocked off with the caps from MikesXS), 6 inch UNI foam filters, MikesXS 1. It’s has a 10mm bolt head and backs out just like a regular bolt. Carb jetting for Amal, Mikuni, Dell'orto, Weber, etc. com accepts no responsibility for the accuracy of these Garage Tips and they are only provided as a resource reference. Engine sounded like a V8 but wrong. Maybe swab inside with a toothpick or a jet cleaning tool. It is recomended to first change (if necessary) your needle jet on Mikuni carburetors. This is how to change your main jet and needle on the stock Road Star 40mm Mikuni Carburetor. Remove the vacuum slide from the carburetor. How a needle and needle jet works on Mikuni carbs - Duration: 7:39. Never a dull moment. The question involves the jets. Luckily there is a spot just for this and an OEM part to install. If screw is tight, do not force. 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. 7 (Below) Remove the regulator diaphragm. More fuel flows. I had planned on getting one of the jet kits from JDJetting for this bike and see if that would help the way the bike runs but if I can't get the slide off to replace the needle or move it up or down on the slide I'll have to take it somewhere and pay a mechanic to try and clean up the jetting for me. The needle jet and jet needle work together to control the fuel flow between the 1/8 thru 3/4 range. The jets (Main Jet, Pilot Jet) do not really wear, except for the so-called Carb Venturis or "Needle Jets", due to the action of the needle vibrating within in it. From that point until the main jet takes over near ¾ throttle, the jet needle taper is the main influence on mixture strength. The needle was installed in the number #3 location. Raising it richens it up. Remove and install the pilot air screw using the following. Check them for "oblong" wear - the needle jet orifice starts out round!. (I have an '82 750 Maxim and an '85 700 Maxim X, California model. Hanging off the bottom of the slide is the jet needle. I purchased my hawk 250 mikuni carburetor and jets from amazon. TM38-86 Parts List. New motor, parts, carb & installation. ), In addition, a plunger vacuum diaphragm and a small diaphragm of the shut-off valve are also arranged. Check them for "oblong" wear - the needle jet orifice starts out round!. The carb was supplied with a 22. the needle and needle jet function in the 1/4 to 3/4 throttle range (mid range) but they also affect the amount of fuel present at wide open throttle. This set of pieces flows a lot more gas thru the needlejet/jet needle combination, but the main jet is about 50 numbers lower than "normal". Put the C lip in the middle setting to start. Remove the coil, horn or other devices on the left side of the engine to gain access to the manifold bolts. I know of no cleaning or assembly manual. To expand upon what Ron found out about the pilot jet. Further complicating matters, I did not notice it had not come out (first time cleaning carbs) and already dipped the upper body in Berrymans, which I assume has melted the rubber gasket off of the needle seat. Engine sounded like a V8 but wrong. The jet can be hard to remove so patience and penetrating oil/carb cleaner helps. The air screw jet normally wears the quickest. On the VM38, this is located in the intake bell on dead bottom. I agree that the OP is describing the emulsion tube/ needle jet. mikuni float needle valve. Get the pilot setup first, then the mid and finally the top end. I need to try again with a wooden stick with needle out I guess. With help of Haynes manual have disassembled but the inlet needle valve seat does not come out of the upper body. the needle valve (15). We’ll see you at the finish line. Not sure if you push it down into the carb body or if you need to remove the metering saddle to remove this. SOHC/4 Owners Club Forums. I want to caution folks that when adjusting the needles it is more critical that you DOO things carefully and double check your work. Includes Phillips/Flat Head bit to remove/replace. 9% pure) needles and genuine Mikuni jets. Pictorial TK carb Main jet, needle spacing change DISCLAIMER: The following thread is for entertainment purposes only. Remove the spring and plunger from the cable. com FREE DELIVERY possible on eligible purchases. Mikuni BDS carburetor parts and rebuild kits. This aftermarket main jet removal tool set has a separate Mikuni hex main removal tool and a combo Mikuni 6 and 8mm round main jet tool. Mikuni BSR-36 + OEM S/SM Exhaust; Kehihn FCR 37; Mikuni BSR-36 + Aftermarket Exhaust. KZ900 Factory Tune Up Specs. Mikuni has long been a leader in powersports by getting engines the perfect fuel mixture to maximize its potential for power. This 92 page manual includes exploded parts views, parts listings and optional parts. These are often overlooked in carb repair and rebuild jobs. Specializing in Hard-to-find Vintage Japanese 2-Stroke Street Bike Parts for Yamaha, Kawasaki, Suzuki, Bridgestone, Ural Motorcycle Sales, Zero Motorcycle Sales, Sherco Trials Bikes, Scorpa Trials bikes. 2-stroke Mikuni carb on a 4-stroke. mikuni bs 34 jets. Before using this site please read the site disclaimer. Regards, PC. OEM Mikuni High Speed Jet - Size 130 Wear Ring Removal. After determining that the carb is going to work out by using my father in law's identical carb from his jet ski, I bought the one for the Sonerai today. Look straight down and you will see the top of the needle dead center. Using hex driver, remove main jet and the ring that the jet holds on. Dennis Kirk carries more Mikuni products than any other aftermarket vendor and we have them all at the lowest guaranteed prices. spring seat. cos if they dont stock a reasonable range of carb jets&needles i reckon the results are limited. Be sure not to lose it during removal. 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. Keep all the jetting , at least the different jet numbers and such , from the original carb. Please note: Not all unblock requests will be successful as it is dependent on how your IP address is being blocked. These Mikuni 6 Series carburetor needles are high-precision and calibrated for an extremely accurate fuel flow rate. The thicker the diameter of the needle, the less fuel can be drawn. Genuine Keihin part 1202-834-2000. I've never worked on this model carb before and I didn't want to go pressing too hard on stuff without asking! Thanks for any help. Do not over tighten these small brass parts as they can be easily damaged. last night i was try using 17. As a general rule when you put say a 26mm or bigger Mikuni on a 107cc four stroke engine you need to over jet the main to get enough gas up, cause the bigger the carb on that engine, the less vacuum there is going thru carb, which is needed to draw gas thru the main jet past the needle jet and up into the carb. GENUINE MIKUNI NEEDLES. Yamaha Carburetor Vent Overflow Hose Gas Fuel Line Kit Yamaha Blaster Oem Mikuni Carb. Needle jets: 2-stroke vs. I'm not sure how long it takes to kill them or what the symptoms might be when they are bad. SO a large round mikuni jet that is a size #115, has a inlet smaller than a long hex jet thats a size #115. 1) When bottomed, the throttle valve is positioned so that the jet needle assembly can easily clear the notch in the throttle lever. Do NOT pull on the jet at the primary choke shield as it is easily distorted. DISCLAIMER: RoadStarMagazine. position of the CIRCLIP (up the NEEDLE JET for richer and down the NEEDLE JET for leaner) 2. Use penetrating oil and heat, and take your time until. I stand corrected if I'm misinformed as I was assuming that the Mikuni 40 was set up similar to the Mikuni 42 carb where only the jet needles can be changed for a different size and not the needle jet. Mikuni PHH Performance Carburetor Service Manual - Copy. Online shopping from a great selection at Automotive Store. HCP22383 OEM Mikuni main jet HOLDER-SPACER TUBE, this is the 1” long brass tube that screws into the carb body, and then accepts the main fuel jet at the other end. From that point until the main jet takes over near ¾ throttle, the jet needle taper is the main influence on mixture strength. It acts as a fine tuning component in regulating the fuel-air mixture. mikuni sidedraft diaphragm (4) standard side draft 33 mm mikuni cv rebuild kit. Once you get the jetting dialed in, you shouldn’t have to mess with anything other than possibly an air screw adjustment in the cooler riding season. Raising or lowering the needle deter-. This area. Page 92 FUEL AND LUBRICATION SYSTEM Remove the needle valve retainer and needle valve. For Mikuni VM26SS carburetors. 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. There are a total of four jets. MIKUNI SUPER BN SPECIFICATIONS GENUINE CARBURETOR REBUILD KITS Kits include all necessary gaskets, diaphragms, and hardware required to disassemble and rebuild Mikuni carburetor. They may be screwed in (they have a hex shape top) or pressed in (round top shown above). 99 each Includes: Float Bowl Gasket, O-Rings, Carburetor top gasket, Float needle & Seat, Main Jet, Pilot Jet, Adjustment screw, & Spring. ) excel pump #70 ( a little rich) 5. I want to caution folks that when adjusting the needles it is more critical that you DOO things carefully and double check your work. Buy Carburetors Carbon Dirt Jet Remove Cleaner, 13 Cleaning Wires Set + 10 Cleaning Needles + 5 Nylon Brushes Tool Kit for Welder Carb Chainsaw Spray Guns Torch Tips Firing Hole Stove Burner Holes: Carburetors - Amazon. I'm not sure how long it takes to kill them or what the symptoms might be when they are bad. Time to do some fast runs. Bypass all with Slide control throttle on the carb. A number is stamped on the side, There is also a four digit/letter number on the needle. Mixture proportioning is accomplished in needle jet. Step 10: Finally, with all the jets removed, and carburetor ports open, the main body can be cleaned. TRider06, Sep 17, 2019. jetting a mikuni power jet for a 400. Page 2 of 2 - Mikuni Needle Seat - posted in MXZ / Legend / Summit / Grand Touring / Formula : Seat that is worn into a square. com the official home of Mikuni American Aftermarket Carburetor Division with Product Catalog, Consumer and Media Information, Distributor Contacts and Mail Order Sales. Using hex driver, remove main jet and the ring that the jet holds on. TRX 850, 96 and all other years with BDST38 Mikuni carbs. mikuni cv drilling slide. 5 needle valve for all BN/SBN carburetors (not Round Body). Is the carburetor a slide type with a needle jet and jet needle? Do you have or can you get a picture of the carb? If it has a jet needle, the top of the needle will have grooves in it (up to five) for a small C clip to sit in. We’ll see you at the finish line. Makes senseMy carb seems to be a bit touchy wishy washy as to how the engine runs. I stand corrected if I'm misinformed as I was assuming that the Mikuni 40 was set up similar to the Mikuni 42 carb where only the jet needles can be changed for a different size and not the needle jet. Please login or register. If it stops close to the threads, it's a VM and if it stops close to the other end, it's a BS. The top is the blunt end of the needle. The HSR48 carburetor features an extended main jet and larger needle valve assembly that enhances fuel flow to the engine. Tool Kit for Mikuni HSR and TM pumper carbs quantity. Top Left side - This is a picture of the needle jet area of an emulsion tube from a stock 38mm CV Mikuni carb as installed on Ducati, Yamaha TDM/TRX 850, YZF750, FZR1000, etc. Poor milege at these speeds can be corrected by fitting a leaner jet needle. Never a dull moment. 5 pilot jet installed and a 25 in a bag. mikuni motorcycle carburetor diagram. Also fits the 40mm "I" body carbs. 5 coils and read plug chops to jet for filter and exhaust. Mikuni Carb Picture(View) NOTE: The Hitachi Carbs article found on this website tells about removal, disassembly, tuning, and common problems. Only use Genuine MIKUNI carb kits and Mikuni needles & seats. 9% pure) needles and genuine Mikuni jets. Remove the screw securing the control arm and remove it and its spring. The emulsified fuel then passes through the clearance between needle jet (5) and jet needle (7), and is discharged into the venturi (A). Please login or register. The main jets are probably ok. The closer to vertical it is mounted, the more the cable binds. If you're ever going to try and get as much horsepower as possible from your Duck, save the $$ from the jet kit and go for the carbs. Needles removed. Get genuine Mikuni jets, I think I got mine from Dennis Kirk. Remove foreign material/dirt. 5 pilots before pulling the extra. Took a close look through the carb, and found that the jet block gasket had squeezed out and was a potential leak. Guides you through tuning and trouble shooting for the popular lines of Mikuni Carburetors. How to Install and Remove a Carb. -Q2 Needle Jet - 35 pilots - 6DH4 needles - 260 jets Ive taken off the really long float bowl nuts and have 3 short ones from some VM 34's. Needle Jet (Emulsion tube. pdf), Text File (. The emphasis here is to find the correct needle or needle jet diameter, which will allow more fuel to pass than is needed but not so much that the needle itself has no control below 3/4 throttle. Remove the main air jet. I've never had a Scorpion with a Mikuni carburetor. DISCLAIMER: RoadStarMagazine. Needle jets: 2-stroke vs. A jet kit goes for like $85, then you'll have to pay a shop 2 to 4 hours of labor to install it. The emulsion tubes screw into the carb body under the needle jets. It also offers the highest air flow with accurate fuel metering. Needles 6F9 Needle Jets P6 Needle clip position 3rd from top I'm in Toronto so about 250 ft above sea level. Mixture proportioning is accomplished in needle jet. Keihin PWK jet block O ring gasket. There are No checkout buttons on this page. Turn the carburetor over. Needle Taper Diameter Dimension Chart (a)=Needle Length (mm) (b)=Length between points (x) and the taper point (Y) 1=10mm 2=20mm 3=30mm 4=40mm 5=50mm. When we tuned our Mikuni we tried about ten different main jets, five pilot jets and every clip position on the needle jet. ) Also replace the slide needles and jets as they wear fast when the slides are loose. E - Remove the main jet Note the size stamped. They differ only in the diameter of the straight section of the needle. Got an '82 Yami IT-465. com the official home of Mikuni American Aftermarket Carburetor Division with Product Catalog, Consumer and Media Information, Distributor Contacts and Mail Order Sales. Mikuni Large Hex Main Jet 4/042 Large Hex. While the needle jet is a critical part of the total function of a Mikuni, I would not expect that jet to foul out an engine unless you leave the jet out when rebuilding. Thanks - I kinda figured it out after I posted. With help of Haynes manual have disassembled but the inlet needle valve seat does not come out of the upper body. Here's what's really strange, one article I found this afternoon said to REMOVE the main jet & run the idle mixture & pilot jet only to set the idle(?). HIgh performance Mikuni 46mm carb, with primer fittings installed. See Worn Needle and Worn Needle Jet diagram. The emulsion tubes screw into the carb body under the needle jets. To expand upon what Ron found out about the pilot jet. It can break very easily. Mixture proportioning is accomplished in needle jet. Steve) The needle that is held in place with a circlip and has the two spacers, is the "jet needle". Turn the carburetor over. Remove the OEM needle, spacer and washers, noting order of assembly. Remove the belt guard, allowing more space to get to the air box. 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. Remove the cable end holder from the slide and the needle comes right out. Hi spindlehead,i reckon your now spot on with your jet/needle settings. Ive put the needle back to the original position now, 2nd clip from top. It is important to note that this manual contains some warnings and cautions against ceivable ways in which service, whether or not recommended by Honda might be done or of the pos- The carburetor identification number is on the car. 7 (Below) Remove the regulator diaphragm. 4-stroke needle jets. The closer to vertical it is mounted, the more the cable binds. Don't attempt this at home. These Mikuni 6 Series carburetor needles are high-precision and calibrated for an extremely accurate fuel flow rate. With the 22. One of the main differences between the Amal and the Mikuni VM is with an Amal, the tip of the jet needle never leaves the needle jet orifice. Needle Jet TM32-1,. Remove the two nuts which secure the carb to the studs coming out of the engine. See Worn Needle and Worn Needle Jet diagram. The emphasis here is to find the correct needle or needle jet diameter, which will allow more fuel to pass than is needed but not so much that the needle itself has no control below 3/4 throttle. This is a discussion on 2-stroke Mikuni carb on a 4-stroke within the Technical forums, part of the Caferacer. Was hoping someone could help me with a question. Make sure the timing is spot on, valves are adjusted, carbs are synced and air filters are on. i know from exp there numbering systems are differnt than oe numbering, but yes the dj130 you mentioned is a "130" jet, but will be differnt than a "130" mikuni jet. Its controlled by an arm, if the carb is upright the needle should fall out of its hole against the arm. Kit helps to smooth out the powerband and remove the mid-range hesitation and leanness resulting in better acceleration from idle thru full throttle. This is way more than enough wear to cause overrich low speed problems. Needle jets are threaded for specific main jet types. Lowering the needle into the carb leans the afr. The most popular jetting kit for the stock carb is Dynamometer repair The most complete kit is Procycle's stock carb jet kit. Never a dull moment. Remove the pilot jet, main jet, and needle jet holder. Page 92 FUEL AND LUBRICATION SYSTEM Remove the needle valve retainer and needle valve. A dysfunctional carburetor makes boating no fun. Disconnect the choke cable from the frame. Note that the 650, 750, and 780 versions are all the same, with a few minor variations I will point out. If you can find a set, or if you're rebuilding yours, Z1 is a great source for CB750, GS750 and KZ1000 smoothbore carburetor gaskets and O-rings, pilot jets, main jets, needle valves and more. Note that there are several types of Mikuni pilot jets. Check out the deal on Mikuni SBN Carb Rebuild Kit Sea-Doo/Kawasaki SXI Pro/Polaris/Yamaha at Watercraft Superstore. Mikuni TMX Float Needle and Seat with O-ring Seal: Mikuni TMX Main Jets: Mikuni TMX BSR Pilot Jets: Mikuni TMX Needle Selections - 25 Year Collection: Mikuni TMX Needle Tapers Starting Point - Black Line: Mikuni TMX 6BFY44-73 Needle Straight Diameter Marked with Sharpie: 2017 KTM -TMX Late Model V2 Inlet- Needle Jet is Removed: TMX Late Model. To view the needle jet size you need to remove the needle jet by removing first the slide assembly and then the main jet assembly. 5 pilots before pulling the extra. Can jet for application. (I have an ‘82 750 Maxim and an ‘85 700 Maxim X, California model. The jet can be hard to remove so patience and penetrating oil/carb cleaner helps. If search results do not exist, please search by others keyword. -pilot jets 25-needle jets 159 P4-needles 6F5-2. It is keyed so it can only be installed one way. The air jets at the inlet all have slots for removal. Mikuni supplies four different jet needle sizes to accommodate tuning requirements in this range, one set of four for the HSR42, four for the HSR45 and another set for the HSR48. Engine sounded like a V8 but wrong. Hot Products Low High Needle Arm Spring Low Speed High Speed Choke or Part # Carb. 5 again and get good idle on 2 counterclockwise screw. ) Removal and installation procedures are based on this model and may vary somewhat. Remove the jet needle cap ④, spring ⑤, retainer ⑥, and jet needle ⑦. Carburetor (Mikuni) Rebuild Kit with Jets 1976-77 KZ900 A B $29. I hope you can get it fixed. Before beginning you should adjust the needle clip position so the beginning of the needle taper is at the top of the narrow part of the needle jet when the slide is a certain % open. Pilot Fuel Screw meters fuel with standard setting 1/8 to 1/2 turn out maximum. From that point until the main jet takes over near 3⁄4 throttle, the jet needle taper is the. This is a BRAND NEW Vito's Performance Yamaha Banshee carb rebuilt kit This includes everything to completely rebuild your Banshee 26mm Mikuni stock OEM carb Includes the exact items seen in the photos: bowl gasket, main jet, needle jet, seat, needle, orings, clips, springs, etc This will do. ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑩ ⑨. Do not over-tighten the new jets when installing them. It also offers the highest air flow with accurate fuel metering. OPAS Removal Kit SeaDoo; Jet Pump Drive Line. 020 needle shim. Find many great new & used options and get the best deals for Genuine Mikuni Size Jet Needle 5FL14 at the best online prices at eBay! Free shipping for many products!. It has Mikuni carbs and many parts are osolete. As the throttle slide rises and falls, the needle moves in the needle jet. Don’t worry, jets are only a few bucks, and they share the same jets as most other Mikuni VM and TM carbs. If screw is tight, do not force. Jets Needle Gasket. Browse your favorite brands affordable prices free shipping on many items. So I took the other set of carbs apart; it's even worse! Needle Jet - Q-6 Jet needle - 6DP5 Main Jet - 90 !!! Pilot - no numbers Have any of you that have bought conversion kits with Mikuni VM32's found. Remove the pilot jet. Easy to install and tune - no slide drilling. Also when using the #40 pilot jet only turn the PMS screw to 2 1/4 - 2 1/2 turns out an not what the Barons instruction calls for. xs 650 sales vm 34 mikuni carbs. Remove the carburetor jets. 5 pilot jet, needle clip in the center position and air screw two turns out (stock position). Ive put the needle back to the original position now, 2nd clip from top. If you need to change your needle jet contact us at. Motorcycle Carburetors & Parts. Thats why a 160MJ is similar to a smaller 155DJ. Needle Jet California and U. 2 X 32mm VM Mikuni with rich condition in low RPMs and somewhat ok in mid range. It may appear to be the same as some CV carbs, but it is different and will not correctly work in CV type carbs. While the needle jet is a critical part of the total function of a Mikuni, I would not expect that jet to foul out an engine unless you leave the jet out when rebuilding. Remove the Harley choke cable from the stock carb.