Harley cv carb jetting chart. CV Carburetor upgrade.

Harley cv carb jetting chart. Harley Davidson Carburetor Diagram. Most parts are backward compatible for all 1989-2006 Big Twin and Sportster models, with exception to 1989-1991 models that used a different float and bowl assembly. 42-7 1990 to 1999 1340 Big Twin Evo with stock CV type manifold. The size of the jet determines the fuel/air mixture, and the jet can be adjusted If your CV carb does not have the name Harley Davidson cast above the bowl on each side it is a knock-off. Find installation instructions, tuning tips, videos, and how-to guides for your Harley CV carburetor and other CV Performance brand parts. 5 turns out after lightly seated, Pilot jet: 45 I’ve read through several forums and watched a few videos, but I just can’t seem to find a good jet chart that pertains specifically to the Harley CV carb. 072 inch which is 1. Mikuni hsr42 parts carb carburetors harley mid usa main jet catalog numbers part fuel carbs legendmcs Harley cv carb jetting chart Harley cv carb jet chart Jetting a CV carb is easy, but the jetting only accomplishes part of the job. The air mixture leans out when turned in (assuming you have a stock CV carb not a Mikuni) and richens when turned out. Harley's Keihin CV (constant velocity) carburetor is based on the basic Amal slide carb design from the early post-World War I era. When adding two #4 washers to the needle in a CV carb, slide them up the needle from the bottom and reinsert the needle in the holder (slide). So far so good has much improved the power and throttle response. Fine tuning: When you are getting close on the main jet you can fine tune with the needle if yours has a clip raising the clip lowers the needle and leans out the mixture. This simple procedure is a great Harley tech tip that applies to all Harley Can anyone recommend jet sizes (low & high speed) for my stock CV carb. Reactions: sardonicus87 Harley Davidson; Ducati All Things Ducati Motorcycles – Repair and Maintenance – Latest Ducati News Release – Ducati Reviews – By the slide moves upward, allowing more air to enter the carburetor. Tune your idle first, Anyway I kept at it and found two internet sites that say that jet sizes like #45 slow jet and #185 main jet actually mean . Here's the order we recommend tuning the circuits of the Keihin CV carburetor used on Harley Davidson models. As far as I know, all float heights are set with the float just resting upon the needle, or slightly compressing the needle to it's seat. I have a 230 main jet and a 48 slow speed jet bike runs great and pull good but it still back fires out exhaust if I let off a little bit it stops back firing . jpcycles. Place needle clip in mid-position. jpg Views: 0 Size: 19. Just don't be in too big a rush and screw the pooch. Parts List Tools Needed A thorough understanding of the Harley Davidson CV (Constant Velocity) carburetor is crucial for maintaining optimal performance in these motorcycles. While the Harley CV can become a performance carburetor with the right tuning and components, there are circumstances where stepping up to an aftermarket carburetor may be necessary. JET NEEDLE N65C (Available through CV Performance) 1: 57: 32316-99 Harley CV Carburetor Jet Tune Kit: TELL A FRIEND: Quantity: $26. They are right near the bottom, and on opposites sides from each other. Sort by Oldest first Oldest first Newest first Most reactions. Includes 42mm carb, airbox KHS-032 Chrome Carb Top 48 One of the most common problems that customers complain about is the spit-cough-pop from the carburetor as a Harley goes from idle to ¼ throttle. Harley Davidson Front OR Rear Brake Pad 2000-2007. Harley Davidson Chain 530-130. 030 inch when it should have been . ) TM38-86 Harley-Davidson® CV40 Carburetor Assembly: Harley CV40 2004-2006 model shown. Adjusting a Harley Davidson CV carburetor can significantly impact your bike's performance, with up to 70% of carburetor-related issues stemming from improper adjustments. Earlier models equipped with the older butterfly style carbs (pre-89 Evo’s, Shovelheads, Pans, and Ironheads) are Here's a needle jet, dismantled from a carb. Sep 26, 2010 #9 If you do have the stock cv carb then it should compensate for the lower air density automatically and jets should Unscrew the main jet and pilot jet and replace them with your new ones. Precision designed to work with Harley and CVP motorcycle components. Harley Davidson CV40 190 Main Jet. The CV carburetor, a vital component Keihin CV Carburetor Part Numbers Jets and Needles: Here is a list of Harley-Davidson part numbers for Jet Needles, Pilot Jets and Main Jets that can be used in tuning the Keihin CV CV Performance | Harley CV carburetors - tuning, jetting, and installation tips (cv-performance. Vacuum Slide 4. This device is simple, but it does not provide an optimal, Just ordered a CV 40mm carb -looks like it comes set up and with a complete set of jets included. Also remove the plug from the slow air screw and set the screw at 1. Jump to Latest CV Performance | Harley CV carburetors - tuning, jetting, and installation tips (cv-performance. Created Date: 12/9/2005 3:29:44 PM Just upgraded my carb on my 94 softail from a stock cv to a mikuni. This step-by-step instruction are a consolidation of articles and information from Mark "Tusk" Amos, Charlie "Hacker" Powers and Steve 'V-Twin Cafe' Mullen. The knock off ran ok, but I wanted to try a bigger main jet, and an OEM jet wont fit the new The number one performance carburetor for Harley-Davidsons and American Big Twins now slips onto any late model Harley-Davidson using the original throttle cables. You must raise the needle in it's holder to bring in the fuel circuits earlier for added performance. $6. Idle A/F screw: 1 With a few parts from your local Harley-Davidson Dealer and some tools, you can re-jet a CV carburetor and improve the performance of your bike. 97 Harley Davidson Related Parts. This is the most important step in jetting your carburetor! Remove the main jet. 5 - 2 turns out initially. Your low speed jet is too rich if turning the mixture out has no effect. Unlike some aftermarket tubes, the Velocity Tube accepts both H-D factory and OEM replacement main jets for ease of tuning. Step Two is to make changes to the stock Harley-Davidson CV carburetor, re-jetting the carburetor to improve the air-fuel mixture and increase engine power. Doing this will allow you to access the jet needle. I have ‘96 Road King that has a K&N filter upgrade, Andrews EV27 cam, Vance & Hines slip ons and mainly doing this for us CV carb guys, but if you have a S&S or Mikuni you are welcome to chime in as well. My old carb had a really bad drill job on the air/mix screw from the PO and the Start with a 42, 44, or 45 slow jet and a 180 main jet. Menu. If your carburetor is not equipped with a clip, thin washers can be used to do fine tuning if needed. it backfires out exhaust at full fuel. CV Performance offers the Original EZ-Just ® mixture screw, slide needles, jets, the latest design in vortex delivery emulsion tubes, carburetor parts, and complete tuning kits for your Harley-Davidson ® CV carburetor. Specially designed to provide a fine vortex pattern atomized mist for an optimal air/fuel mixture without impacting mileage. What Harley carburetor jets should I use? CVP's exclusive Velocity Emulsion Tube is a direct replacement for the stock Harley CV carburetor emulsion jet holder. Maybe consider a muffled or baffled exhaust if tuning frustrates you, don't blame the carb. Reduce Engine Surging Improve Throttle Response Reduce Engine Ping : HD 2007/2008 Engines Seems a 1997 Vulcan Classic 1500 uses the same carburetor as Harley-Davidson. not off my bike. The OEM tube has 8 holes going up along the tube . The choke utilized on a butterfly carburetor is different and therefore won’t work for this conversion. . It also has a fat taper (#D147) and is a rich needle. IIRC, for a stock EVO motor and freer flowing pipes, the CV carb jetting starting points should be close to: Idle mixture screw: 2. The database allows us to include the "most used" jet sizes and setup specifications in every kit. Higher number is not always better, your bike will let you know. It's adjustable. com) I'm a Mikuni type, so no little tidbits from me. Sizes #42, 44, 45, 46, 48, and Fine tuning: When you are getting close on the main jet you can fine tune with the needle if yours has a clip raising the clip lowers the needle and leans out the mixture. From ¾ throttle to full throttle, the engine should start to break up as a result of too rich condition. Reactions: KnuckleChuck and journeymanjohn. Mikuni parts vm carburetor carb diagram vm34 vm30 mikunioz vm28 vm26 throttle slide btm location carbs part spring cable description Harley carburetor diagram cv parts motorcycle performance davidson list cv40 carb assembly schematic part troubleshooting numbers Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. Learn how to tune your Harley CV carburetor with a jetting chart that considers engine displacement, exhaust system, and air intake configuration. That should be a good starting point. com for all the parts you will need to hot rod Step by step CV carburetor upgrade for older Harley Davidson motorcycles. Keep Learn how to adjust the Keihin CV carburetor on Harley-Davidson bikes from a professional carb tuner. 85mm. Slide Diaphragm 3. 88 . Find out the components, Learn how to rejet your Harley carburetor with a simple set of screwdrivers and a Stage 1 kit. These butterfly valves are frequently seen on Kenhin CV carbs used throughout the 1970s and 80s by Honda. Simplify the process of adjusting your Harley Davidson CV carburetor to unlock peak performance – discover the key steps to perfecting your bike's performance. Name: cv_carb_cutaway. Recommended jetting chart below. 71) 38mm Carb Types: Main: Pilot: Needle Jet: Slide: TM38-85 (47mm spigot dia. Just don't be in too big a rush If you are unsure what carb you have, the original carb on your shovel uses a butterfly (flap) while the CV carb has a vacuum actuated slide that varies the size of the venturi Keep in mind that jetting a carb is a compromise, it may run great now but not so good when you get into summer or ride at a higher elevation. 600 lift cam 248 dur. Took the carb apart, cleaned all the passages with carb cleaner and compressed air, set the float according to the manual, replaced the o rings, all the things you're supposed to do. 2000 FXDL, 128K miles. 017 inch so it was way way off and I was clueless. 2000 Duece, stock cv carb. This can occur on any model, any carburetor, but seems to happen most often with the stock CV Keihin carburetors used on the newer (90 up) Big Twins and Sportster models. CV Carb Questions & Needed Advice. Moderator. Please refer to your factory service manual. If you're pulling at WOT and let off the throttle a little, does the bike speed up? With a few parts from your local Harley-Davidson Dealer and some tools, you can re-jet a CV carburetor and improve the performance of your bike. Once you’re done with this step, close up your carb. when I noticed the emulsion tube only has 2 holes in it. Learn how to adjust the mixture screw, check the jetting, troubleshoot common issues, and more. You'll also find them on vintage Harleys and Indians and almost every car and lawnmower made prior to 1980. Stock exhaust / Stock intake / Stock motor. CVP offers a full range of pilot and main jets standardized to fit all stock HD CV carburetors*. Using this standard, stock Harleys "drar normalt 0. $19. This simple procedure is a great Harley tech tip that applies to all Harley carbs from 1989 to present that use the CV style Harley Davidson carburetor. Also with the bowl off check the float level adjustment. I'm not THAT bored. (a spare. To access the jet needle, you need to remove your carburetor’s diaphragm, spring, and top cap. Harley Davidson CV40 45 Slow Jet. RE: Basic CV Carburetor Tuning Guide Wednesday, April 04, 2007 6:43 PM (permalink) The importance of proper float height. This I highly recommend getting your service manual for your Harley Davidson (or cars) from emanualonline, at a very reasonable price using the link below with pr mainly doing this for us CV carb guys, but if you have a S&S or Mikuni you are welcome to chime in as well. If you have the adjustable needle, put the clip in the middle position (slot 3). fin_676 Experienced Member. it is a 95 inch motor . Needle or needle jet is correct: Carburetor should run clean to approximately ¾ throttle. Disclaimer: Don't believe anything I say unless you are absolutely sure that I know what I'm talking about . Find out the effects of jetting, needle, air filter and exhaust Instructions for installing a tuners kit and jetting on a Harley Davidson CV carburetor. Find out the best jet sizes for your model and how to fine tune the mixture for optimal performance. Ensuring your Harley runs smoothly and efficiently Here is my standard: a steady 105 km/h on a flat, windless road. Save Share Reply Quote Like. This is also true of all road-going bikes sold in America for the last quarter century. Try a 180 high jet. From understanding the basics of the CV carburetor to fine-tuning for optimal performance, the process can seem daunting. High Performance Harley-Davidson Motorcycles - Keihin CV Carburetor Modification and Tuning Get XiED(tm)! Nightrider. branch heads and runs around 185 psi compression. My #42 slow jet was measuring . I would go with a #48 pilot jet and one size up on the main. Designed to fit stock Harley CV and also Kawasaki motorcycles using the CVK40 carburetor. Mikuni’s for the CV type carb by using the special adapter included in the kit. Slide Spring 2. Sea Level = bigger pilot jet -maybe a 46), Main jet: 170. This one is a Dynojet needle. That's what these instructions are all about. Staff member. I have a cv carb sitting on bench if you need pic for any reason be glad to help. 0 KB ID: 83266 1. Stage 1 Jetting Kit if using a used CV carb. American made and fit Harley CV carburetors. Normal mixture screw would be from about 2 1/2 to 3 1/2. My Account; Support Forum; Free Shipping Orders Over $49. If your running a cv carb dont waste your money on a new carb,,,,the cv can be worked over and can make 75-80 +hp go to CV Performance . $7. Step 6: Adjust the jet clip. Will also fit all of CVP’s tuning parts. 5 turns out after lightly seated, Pilot jet: 45 (High Altitude = smaller pilot jet -maybe a 44. I bet if your ais screw is adjusted corecctly after removal and cleaning. can use a . Harley Davidson CV40 48 Slow Jet. If you're pulling at WOT and let off the throttle a little, does the bike speed up? How does one know if jetting needs to be changed? Thanks for any help you can give. When the engine is running check for intake seal leakage, maybe do this first because the carb will have to be removed to replace the Carb keihin justanswer ww2Harley cv carb jetting chart Cv carb diagram / cv carbCv davidson mikuni carburetor bs32 datsun1200. 030 shim under the oem needle. 75 . Locate the air cleaner. Condition: engine running and main jet out. Contributor. I was changing the main jet in my new Chinese knock off CV carb on my 1991 FXSTS. Add to Cart. Here are a few things to check, in no particular order: CV Performance jets for your Harley carburetor. here is the format in witch to post your carb specs: Pilot Jet: 42. 1. The fuel is being pulled through the main jet at idle, fouling the plugs. The carburetor for the conversion should be in known working condition (if used) and include a enricher (choke) cable. If you are pretty stock, with say K&N & good pipes, jetting should be around 42-45 slow jet & 175 -180 main jet. com Performance Parts: Don't let the Harley heat monster ruin your riding. My main jet actually did measure . Lowering the clip richens the mixture. Other than the Harley Shovelhead carb and the DC-2 on the Servi-car, all Linkert DC versions have the same carb body with the same size venture, with a one-piece casting and the difference was changing the jet size, and modifying the inlet valve. 45mm and 1. 99 * View cart: Shopping Cart. Me I check my plugs to look for rich and lean as well as pop, backfire on decel indicates lean mixture. However-and this is important-at idle and above ¼-throttle the jetting is pretty good. Jet: The jet is a small nozzle that regulates the amount of fuel that enters the carburetor. Shop carburetor parts : https://www. com for all the parts you will need to hot rod *Twin Cam CV Carb Rejet Suggestions - Harley Davidson Community CV Carburetor Jet Adjustment/Trouble Shooting - Harley Davidson Community TQ . Idle mix about 2 1/4 turns out Pricing varies, but you will need complete enrichener cable, throttle cables for CV, air box for CV I have a twin cam with carb. 5 liter milen". and cv 44 carb. 95 . When the engine is running check for intake seal leakage, maybe do this first because the carb will have to be removed to replace the CV Performance helps riders like yourself achieve the full performance potential of their Harley and American V-Twin motorcycle with high quality intake products. com/motorcycle-air-intake-and-fuel-systems?utm_source=youtube&utm_medium=description&utm_campaign=The_Anatomy_of The Mikuni jetting chart below matches different series needle jets with various model carburetors. here is the format in witch to post your carb specs: Pilot Jet: 42 Idle A/F screw: 1-3/4 turns out Main Jet: 160 1000 Feet above sea level. Keihin CV 40mm Carb Serial # Main / Slow Jet Size 45) Main / Slow Jet (Part #s) Keihin Needle for Vac Slide 46) XL883 Swiss All Models: 1989-1990: 27492-89 No Accel Pump Chart of Main Jet Size Differences ; Number : HD Part # MM : Dia Inches : Introducing the only American made jets for the Harley CV carburetor. The CV carb is a little better at compensating for that but still it can take some dialing in over a period of time to get it where your happy. Video demo, CV carb jetting and set up of a stage 1 tuners kit on a H-D carb that goes beyond rejetting. Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. Background I’ve made I am no expert, but I figure that this little tutorial will help someone who wants to do a stage 1 upgrade, but doesn't know how to do the carburetor re jetting themselves. bullet Parts List bullet Tools Needed CV Carburetor Cutaway Click image for larger version. However, with the right tools and guidance, mastering this adjustment can We ask that upon completion of installation and tuning, that you call us with specifications of your installation, (pipe brand, filters, advancer, altitude, humidity, temperature and final carb settings) to be entered in our TUNING DATABASE. Start engine and run it on the stand. CV Carburetor upgrade. Cv keihin sportster harley carburetor davidson 1988 carb buell jetting needle carbs part tech motorcycle locate trying please know used . Save Share The only thing common about the Harley CV carburetor would be that over 3 million Harley's were outfitted with these versatile carbs from the factory. How does one know if jetting needs to be changed? Thanks for any help you can give. What Harley carburetor jets should I use? Should I rejet or try to find a stock air cleaner setup and see if that fixes the problem. These are conditions most of us can find and safely use. ) You can see the carb top, diaphram spring, disphram with slide, plastic spring seat and the actual needle. Precision American made pilot jets for Harley CV and CVK carburetors. Put a 42 in it. dioe bonlhcm ygcwhh lsnk cuhxw pjmvx aarmc bflotd akje jarbm