Harley davidson cv carburetor troubleshooting This is perhaps one of the best written book on carb tuning, just ignore the accelerator pump section if using a non pumper carb and remember that the mixture screw is an air screw where as on carbs with the screw located behind the bowl it will be a Jan 4, 2014 · Had spark on both plugs and no vacuum leaks. Jets are fine Free repair manual for Harley Davidson CV Carburetor Tuning Issues and Troubleshooting. Oct 9, 2009 · Since the use of the Kiehen CV carb, HD has used a plastic-over-brass insert. Recognizing common carburetor problems can help keep your ride smooth and reliable. The previous owner took the carb apart to clean it and ever since then the bike won't run right. Earlier models equipped with the older butterfly style carbs (pre-89 Evo’s, Shovelheads, Pans, and Ironheads) are excellent candidates for upgrading to a modern Harley carburetor . Sep 24, 2012 · A forum community dedicated to all Harley-Davidson model owners and enthusiasts. This will show how to remove your float bowl pin And needle Jet. Harley CV carburetors are known for their reliability, but like any mechanical device, they can experience issues from time to time. I noticed a few differences between the 2 when I got home. Also: next larger size pilot jet (from # 42 to 44), "EZ-Adjust mix screw Oct 23, 2013 · 2004 Dyna Lowrider Harley Heavy Breather,Stage 1,Screaming Eagle mufflers. Here are some common problems that riders may encounter with a Harley CV carburetor and some troubleshooting tips to help resolve them: 1. NOTE All carburetor tuning should be performed with the engine warmed up to normal operating temperature Jul 6, 2019 · NEW Suzuki Samurai Sidewinder CV kit, including NOS Harley-Davidson/Keihin CV40 Carburetor. I just bought a 89 sportster 1200 with a cv carb . This demonstration is on a Constan Feb 18, 2007 · Once you get the carburetor off, there's nothing to it. Harley-Davidson® CV40 Carburetor Assembly: Harley CV40 2004-2006 model shown. If you snap the throttle open then closed it revs up fine . IMPORTANT MESSAGE END OF THE VIDEO YOU DON'T WANT TO MISS!Just my own personal run through on how I rebuild a my KEIHIN CV Carburetor that's I use on my Harl Oct 12, 2024 · Riding my 03 sporty today and I stopped at a light and smelled gas. Jump to Latest 21K views 74 replies V-Twin Harley Davidson forum. If you've got a problem with the float sticking, then that's most probably caused by trash in the fuel line or degrading fuel line, etc. Feb 12, 2025 · Common Carburetor Issues. Disassemble the carb and clean it out with carb cleaner. I've Mar 6, 2010 · I rebuilt my cv carb because it was leaking gas out the overflow it would keep running through the carb until I shut it off at the petcock, well i rebuilt it and it does the exact same thing, the carb was 2 months old when taken off with very little miles, but it sat on my shelf for close to 3 yrs, did everything ruin because of this ? the carb Sep 9, 2023 · Buy CV Carburetor Rebuild Kit for Harley Davidson CV40 27421-99C 27490-04 XL883 CV 40mm Carb Repair Kit 27421-99A Rebuild Kit CV Carb Rebuild Jet Kit: Carburetors - Amazon. When it is time to rebuild that carb, do it right. Was afraid to clamp directly in vice si I took a piece if hard wood, drilled a 3/16" hole, split the wood parallel to the hole, inserted tube, clamped in vice, slight twist, it's free. 2 out of 5 stars 472 impractical for bikes with CV carbs, since the effects of the needed ¼ to ½ turn adjustments to one idle mixture screw are imperceptible to ordinary mortals. Using the mixture screw or optimizing the fuel mixture can both be effective ways to achieve this. Step by step section by section. After 2 year sens Aug 30, 2003 · 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. If you still have a plastic one, they're prone to breaking and restrict flow, with their 1/4" inlet opening. Easiest just to rebuild it and then you know it is in good shape. See Additional Information below for fitment. com FREE DELIVERY possible on eligible purchases Apr 30, 2021 · 110 big bore 10. I noticed there was some hesitation and back firing. Drilling the vacuum port hole to 1/8" is another way to get the slide to move faster giving a quicker throttle response. 6000 of them since I got it last year. Mar 12, 2014 · Help! Recently got 2002 Sportster 1200 w/2000 miles - completely stock. In this procedure, we instead pay careful attention to the behavior of the bike as it transitions off idle and then returns to idle, and adjust all idle mixture screws to the same setting. Troubleshooting Common Issues with a Harley CV Carburetor. You can get a rebuild kit for it then open up the housing (3 screws) and take a look at what is in there. I'm sure it's a carb issue. the idle Harley CV carburetors* found on the following models: 1990-1999 Harley big twin Evo 1340; 1999-2006 Harley Twin Cam 88; 1989-2006 XL Sportster. 2. For tuning procedures we have a number of manuals available to the left. I have noticed a couple things I don't really like (fuel mist coming out of front of carb, stumble at 2500-3000 rpm), so if any of you guys can shed some light on those, that'd be awesome. It sat on the bike for a couple years and needs a rebuild. 1 out of 5 stars A direct replacement for the factory discontinued Harley N65C needle. Mar 8, 2010 · The correct way to set the float level is with the carb off. Shop carburetor parts : https://www. Learn how to diagnose and fix common problems with Harley CV carburetors, such as vacuum leaks, needle jet, idle circuit, accelerator pump, slide diaphragm, and more. CV Rebuild Kit Replaces part number: 27490-04,27421-99,27421-99C,27421-99A,27465-04,27501-88,27004-89,27415-99C. Buy and install a stock jet needle for a 1988 or '89 1200 Sportster (H-D Part No. jpcycles. Shop Harley-Davidson Carburetor Rebuild Kits at J&P Cycles today. Below are some typical issues you might encounter. Feb 2, 2013 · I hope someone can help: I have a 94 wideglide stock CV carb that I rebuild, Now there is gas leaking out of the accelerator pump and it really comes out when i twist the throtle. 4 out of 5 stars 171 Mar 27, 2014 · Also, if your thread repair is not perfect, you'll need a new carb body. Installation instructions, tuning tips, videos, and how-to guides for your Harley CV carburetor and other CV Performance brand parts. Here is a step by step video on getting inside your CV carburetor. Re-built carb (including gaskets, o-rings, accelerator pump diaphragm, float needle, etc). I wouldn't start at 3 turns out though (at least not on an Evo) for adjusting the afr. Attached is a free bike service manual for a Harley Davidson CV Carburetor Tuning Issues and Troubleshooting. Apr 16, 2012 · When I rebuilt my carb and installed a CV Performance tuner kit it came with the screws and when I had to change my main jet it took all of 5 minutes. Installation kit purchased from Low Range Off Road (LROR) for a unique project that I'm now parting out. Then go back together with a N65 needle, NO SHIM. I had a dynojet kit in mine when i got it. I purchased the 27728-99 spring out of the SE 44 mm carb. Look down and it's pouring out of the overflow tube. They are right near the bottom, and on opposites sides from each other. He helped me through my CV carb problems. Jun 1, 2004 · I wrote this manual for Mikuni, and although it directly addresses the Mikuni carb, the diagnostic principles apply to the Keihin CV and many other carburetors as well. For more detailed guidance, consult a professional. Please refer to your factory service manual. This brings us to the subject of upgrading these older Harley “Soup Cans” to the newer CV style carb. Knowing how to tune a Harley carburetor opens the door to a better performing motorcycle and more enjoyable rides. To Clean or Replace on your CV Carburator. Bought a HSR 42 Mikini (made in Mexico ) fuel flooded out of it even worse than CV, obviously something missing inside. Come join the discussion about performance, modifications, troubleshooting, builds, maintenance, classifieds and more! Show Less Cycle Craft carburetor rebuild kits and components are high quaintly replacements for OEM components. Do not under-estimate the ability of the stock 1990 and later Keihin CV carburetor to produce good power. Sep 30, 2017 · CV Carburetor Rebuild Kit for Harley Davidson CV40 27421-99C 27490-04 XL883 CV 40mm Carb Repair Kit 27421-99A Rebuild Kit,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit by BOOTOP 4. Apr 25, 2014 · So I've been having fits with my current cv carb. If you have fuel in the carb and float bowl, when you twist the throttle from 0 to open the throttle plate, a piece of metal pushes in against a diaphragm to squirt fuel through the accelerator pump jet. I always use an inline fuel filter. The Harley Davidson CV carburetor is a crucial component for your bike’s performance. I have a late 90's EVO as well with a cv carb. The CV carburetor may show signs of needing to be tuned. This video will show how to remove the plug for your air fuel screw. Screaming Eagle ignition,V&H Short shots. 0 pipes MAMBO #5 bought all brand new except scooter There's a picture of the sportster after all the mods in my images file. 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. The screw turned 4 1/4 turns clockwise before seating. Nobody would know the difference. 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. I plugged up the vacuum line and install a fuel valve that is not vacuum operated. The carburetor will need to be removed from the manifold so refer to your factory shop manual for this procedure. Enjoy the Ride! Jan 26, 2017 · I replaced the original fuel valve on my 98 harley dyna. 44mm Carburetor Tuning Procedures: The 44mm Big Bore CV Carburetor, as shipped, is calibrated for use on modified Harley-Davidson Big Twin engines equipped with SCREAMIN’ EAGLE bolt in High Performance Cam, Air Cleaner, and Exhaust System. Happens at all speeds BUT the one consistent thing is that it's always at zero to just open partial throttle. Jul 25, 2014 · Hi, CV carb has started to spit back. Mar 21, 2016 · Not sure what needle inside the emulsion tube was mentioned this is for the plunger Main needle Harley Sportster CV Carb Keihin Slow Jet 45 | eBay EDIT After looking things over looks like you talking about the Jet & seat for the Jet Needle. They don't use a choke, they use an enrichner circuit. But here's what worked for me, completely curing the cough and backfiring. Discussion on V-Twin Harley Davidson motorcycles including Jun 11, 2004 · Before you go removing the entire ac assembly and carb, look to see if you have enough clearance to remove the bowl without removing the AC. 3 out of 5 stars Dec 12, 2020 · About this item . I bought mine Sep 22, 2024 · Understand Your Carburetor: Familiarize yourself with different types of Harley Davidson carburetors (Keihin, S&S, Mikuni, CV) to choose the right one for your bike model. Sep 18, 2021 · We took the new carburetor and stripped every part off. 79 How to disassemble, record jet sizes and fuel screws as you take them out. They're not direct slide carbs, they use air pressure changes to regulate the slide, as more air gets sucked in, the slide goes up. When troubleshooting a Harley Davidson CV carburetor, several essential tools and resources can optimize the process. Carburetor cleaning methods will also be shown. You can look for the vacuum leak is use a propane torch (unlit. Jul 16, 2012 · 66 305 Rice burner; NO PROBLEMS 67 650 English Bike; MAJOR PROBLEMS 1968/XLCH - lots of mods; loved it for 11 years; NO MECHANICAL PROBLEMS 2012 Heritage 103 Rush 2. Includes the parts necessary for rebuilding carbs A Harley CV carburetor by far outperforms it’s butterfly style predecessors, namely the Keihin, Zenith, and Bendix. Mar 16, 2021 · CV Carburetor Rebuild Kit for Harley Davidson Sportster 40mm XL883 XL1200 CV40 27421-99C 27490-04 CV 40mm Carb Repair Kit 27421-99A,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit 27006-88 AUTOKAY Carburetor Carb Rebuild Kit for HD CV40 27421-99C 27490-04 CV 40mm Feb 16, 2010 · A forum community dedicated to all Harley-Davidson model owners and enthusiasts. lol) So if the pilot jet is too These tuning steps apply to all Harley CV carbs from 1989 to present that use the CV 40mm style Harley Davidson carburetor but also apply to the CVK40 found on other models. com FREE DELIVERY possible on eligible purchases CV Carburetor Rebuild Kit for Harley Davidson Sportster 40mm XL883 XL1200 CV40 27421-99C 27490-04 CV 40mm Carb Repair Kit 27421-99A,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit 27006-88 4. Jun 23, 2011 · I adjusted it up and down numerous times. 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. CV Keihin Carb leaked out full tank of fuel overnight. Doesn't take any super expensive parts. Once I start it up and run it a while the gas stops coming from the pump area and the bike runs fine. The articles and guides below are provided to assist with various products and common carburetor troubleshooting. $50 sure beats $500. I know this is the stock carb. The fixed-venturi carburetor is standard equipment on most Harley-Davidson VTwins. Aug 17, 2021 · First, skip replacing the carburetor. After a couple times doing this it will start and run. CV Vacuum operated carb. Apr 23, 2023 · On the CV carb, float level has some wiggle room. com Jun 27, 2024 · In conclusion, adjusting the mixture on a Harley Davidson CV carburetor can improve the performance of the motorcycle. Thread slow jet into slow jet passage with narrow-bladed screwdriver. Setting the float level, with the carb on the bike is guessing. Mar 27, 2012 · Once the carb body and bowl are cleaned and polished, and the carb throat is polished, I'm ready to reassemble. * Only for use on CV 40mm carburetors from Keihin made for Harley-Davidson. The CV carburetor on your Harley features a mixture screw positioned at the bottom rear of the spigot for adjusting the air-fuel ratio. apperently the 31mm cv was designated for onroad bikes, and the T-top Jan 6, 2004 · 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. Nov 2, 2011 · If you have this, clean out the entire carb and flush out the gas tank with fresh clean gas. 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. 2 out of 5 stars 474 Sep 11, 2022 · As to carb tuning, if you need to tune the carb, there's a sticky thread somewhere with how to modify and tune the stock CV carb. Now I can,t get it to idle unless I have the enricher pulled partially out. Then fill it with fresh gas and try it. Acce Sep 12, 2009 · I'm gonna have to ride with glider on this one. The Keihin 40mm CV Carburetor schematic diagram serves as a valuable resource for understanding the inner workings of this carburetor and can help with troubleshooting and tuning. Do it right with Fix My Hog. In the early 2000's, they finally went to all brass. Feb 9, 2009 · I pulled the Stock CV Carb off My Bike and went with the Mikuni 42mm Carb for the Sporty, What a difference, I am getting the response that I wanted for the Bike and it is easier to set than the CV Carb. Aug 13, 2020 · CV Carburetor Rebuild Kit for Harley Davidson Sportster 40mm XL883 XL1200 CV40 27421-99C 27490-04 CV 40mm Carb Repair Kit 27421-99A,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit 27006-88 4. A 27170-89/45 slow jet and a 27114-88/180 main jet. What is vapor lock? Why does it happen? Watch this video to learn about how to check and fix Harley Davidson vapor lock issues. This 100% brand-new carburetor is crafted with precision and excellence, ensuring that all parts are thoroughly tested and quality controlled. Other models using a 1990-2006 retrofitted CV carburetor. It says harley on the carb but its really a Kehein. Float Needle Removal. Jan 8, 2008 · '01 FLHRCI converted to carb, 95", Andrews 26g cams, Wood 2* advance key, Sta-bo kit, Andrews 34t tran pulley, Supermax 68t rear wheel pulley, Feuling oil pump, Baisley spring, fullsac dual conversion, thunderheader slip-on exhaust, Ness Big Sucker intake. Seriously, paid £215 for a replacement CV carb (made in Tiawan and brought in from USA) absolute shite do not buy one of these carbs. Always start with a fresh set of spark plugs when tuning. A chart I had gave me the specifics for which needle to use for my year and my carb but being a newer type carb has me a bit confused here on which needle to use. The knock off ran ok, but I wanted Harley-Davidson Carburetors & Carb Parts The world of Harley carburetor tuning is vast. Aug 7, 2014 · When my 2000 softail is not running and I give it gas -- gas shoots out of my carbs accelerator pump. Right now I'm having trouble with a 2001 Sportster 883. Harley Davidson CV Carburetor - Tuning Issues and Troubleshooting Harley_Davidson_1974-1976-HD Nov 14, 2017 · Problem Think I'm getting too old for this. used the constant velocity (CV) carburetor in the 1988 Sportsters, 1990 Big Twins (EVO and TC88) until 2006. Part Number 27419-99 - Carburetor tuner kit for SCREAMIN’ EAGLE Big Bore 44 mm CV carburetor. CV Carburetor Rebuild Kit for Harley Davidson CV40 27421-99C 27490-04 XL883 CV 40mm Carb Repair Kit 27421-99A Rebuild Kit,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit by BOOTOP 4. I told him that the next time around, he should just swap in a new carb without the Harley marks and labeling. Find tips, instructions, and guides for tuning and rebuilding your Harley CV carburetor. Carburetor Body CAUTION Slow jets from fixed-venturi carburetors look the same as the slow jet of the CV carburetor. , as I bought the bike with 2K miles on it in '93. If it still does the same thing, you have other problems, but you didn't waste your time because the bad gas issue needed to be dealt with before it eats up your carb. NEVER try to loosen carburetor parts using heat. See full list on throttlemeister. I'm including a NEW, never-installed 1995 Harley-Davidson CV40 carburetor (P/N 27486-92B, OEM jets 185/40) with this package. It is responsible for mixing fuel and air in the correct proportions, allowing the engine to run smoothly and efficiently. Like when you overtake someone and then back off the throttle to settle down the speed; the moment I twist to reopen the throttle she backfires/spits out the carb. The classic N65C needle was originally fitted to the first CV carburetor on 1988 Harley-Davidson Sportsters that lacked an accelerator pump, therefore requiring a needle with a richer profile just off idle to overcome the lean stumble. Unscrew the nut on the carb end of the cable and it's off. Im assuming they are interchangeable but didnt know if Cleaning the accelerator jet in my 1994 FXDWG (Dyna Wide Glide) crash bike. Some of these service manuals are PDFs, some are compressed files so you may need third party software to open the manual. This needs to be replaced. I guess you would call that a Stage 1 upgrade. These signs include a drastic decrease in fuel economy, May 8, 2016 · Back around 1992 Harley-Davidson released a bulletin warning not to use a 3 sided valve in the newer CV carburetors. That should be inside the carb body itself. Come join the discussion about performance, modifications, troubleshooting, builds, maintenance, classifieds and more! Show Less. Complete vacuum slide assembly for Harley CV carburetors. The OEM tube has 8 holes going up along the tube . Should be obvious by I won't take the chance) and point it around the vacuum seal areas. I loved the simplicity of them but always thought they were a cheap factory carb solely because you couldn't replace the float valve seat, beings it is pressed in. May 28, 2015 · Took the carb out and apart and cleaned it, cleaned air filter, replaced air filter housing gasket and gasket on Y pipe where carb goes into. Also just fyi number on my carb. Besides the fact that sometimes it would make a pop through the carb I was told you just keep running it and see if things would kind of work Learn about Harley carburetor troubleshooting when faced with issues like feeling a stumble at speed by Fix My Hog. Jan 23, 2021 · CV Carburetor Rebuild Kit for Harley Davidson Sportster 40mm XL883 XL1200 CV40 27421-99C 27490-04 CV 40mm Carb Repair Kit 27421-99A,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit 27006-88 Carburetor Rebuild Kit for Harley Davidson CV40 Sportster 883 1200 XL883 XLH1200 Dyna Glide Softail Night Train Low Rider Road Glide CV Carb rebuild Mar 4, 2023 · My Evo with a CV is really hard starting. I read online that if it turns more than 3 out, the pilot jet is too small. I installed a CV N65 Sportster needle, 45 pilot jet, and a new CV Performance slide spring. FREE SHIPPING on orders over $89 – We Ship Today! May 18, 2022 · Buy POSEAGLE Carburetor Repair Rebuild Kit for Harley Davidson CV40 CV 40mm Carb Replaces 27421-99 27490-04 27465-04 27501-88 27004-89 27415-99C: Carburetors - Amazon. 1996 FXDS-CONV S&S E. Apr 1, 1977 · The constant velocity (CV) carburetor is gaining popularity as manufacturers attempt to combine economy, tractability and performance with low emissions. Still runs like shit I then took apart the carb again and did a very thorough cleaning, this time cleaning main and slow jet orifices with cleaning tool, also dropping out float and needle to inspect them Oct 13, 2006 · A tuned CV carb (without the thunderjet) will serve you right for many miles. 27094-88). The bike has 6500 miles on the clock. CV40 Carb Rebuild Kit Replaces OEM kit 27006-88 for use with all 1990-2006 Harley Big Twin or 1989-2006 XL models using the CV carburetor only. I replaced the accelerator pump diaphragm and o-ring. This precision instrument contributes significantly to Harley Davidson bikes’ performance by regulating engine power and responsiveness. I believe this is the carb. Dec 28, 2021 · CV Carburetor Rebuild Kit for Harley Davidson CV40 27421-99C 27490-04 XL883 CV 40mm Carb Repair Kit 27421-99A Rebuild Kit,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit by BOOTOP 4. Will not fit CVK, aftermarket, or knock-off CV carburetors. Nov 3, 2010 · No serial numbers but they have H-D part numbers . CV hates being ignored. This needle was Feb 29, 2024 · The Harley Davidson CV (Constant Velocity) carburetor is a pivotal component in a motorcycle’s engine, ensuring that the correct mix of air and fuel is delivered for smooth operation. Read about the drilling, washers, etc. HOW TO: CV Carburetor Rebuild In the last couple of run on the Harley Davidson FXR. I am very Hapy with it and will be putting one on My 99 Dyna Lowrider also. I don't even use calipers or anything, I just eyeball the seam on the two halves of the float and look for it to be parallel with the base of the carb body and that seems exactly perfect, that puts it right about the middle of the float adjustment range. Replaces original H-D p/n #27585-88 on CV40 carburetors. Feb 18, 2025 · A 40mm CV carb is what Harley used on Evos and Twin Cams, though the one used by Harley (stock) was made by Keihin. 5-1 comp bigger injectors s&s hp103 thundermax i have a slow start issue when temps are around are around 30 degrees. I also put on an S&S air cleaner. Harley Davidson CV Carburetor - Fine Tuning the Mixture Screw. 1978 Strokershovel Lowrider 100 inches. If you're running a 160 jet now, what mods do you have to justify going to a 180 jet? What color are the plugs now? How does the bike run when you roll on it in 4th gear, from about half throttle to full throttle? The Sportster CV carburetor diagram is a useful tool for understanding the inner workings of the CV carburetor system used in Harley-Davidson Sportster motorcycles. 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 . It is recommended to consult a professional or refer to a Harley CV carb jetting chart for specific instructions and settings. Jul 18, 2019 · Hello all, I decided to adjust the air/gas screw on my 98 Sportster 1200. It is exactly like your top picture. Slight help when I richened it a turn. Harley-Davidson Motor Co. Simply rejet the existing CV carb as needed. Then stripped the carb on his bike, cleaned the carb body, and installed all the new parts we took off the new carburetor. With the help of a detailed animation, we can observ Apr 10, 2020 · CV Carburetor Rebuild Kit for Harley Davidson CV40 27421-99C 27490-04 XL883 CV 40mm Carb Repair Kit 27421-99A Rebuild Kit,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit by BOOTOP $13. Mar 6, 2024 · Troubleshooting a Harley Davidson CV carburetor often involves inspecting for clogs and ensuring proper adjustment. Refunded so all is good. The bike starts and idles fine . Slide replacement is recommended when the diaphragm eventually becomes pinched or torn, or if the vacuum port hole has been modified by drilling 1/8" or larger causing drivability problems. Inside the carb, there's a spring and a brass plunger hooked onto the cable. Throw away the old gas, even if it looks ok. Went 1/4 turn twice on idle air screw both ways with no luck and exhaust coming out of front jug is still cold. Remember, regular maintenance is key to smooth performance. I tried raising the Idle spped but it seems to have no influence. com FREE DELIVERY possible on eligible purchases Harley Davidson Carburetor Performance Tuning Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. Renew your Harley with the Cycle Pro High Performance CV 40mm Carburetor and experience the ultimate in power and performance. Apr 4, 2015 · Carb Illustration: OEM Parts Finder Granite State Harley-Davidson Lebanon, NH (603) 448-4664 You may not need a rebuild kit, but it is a good thing to always have one on hand just in case you need to replace something. The stock CV carburetor has a venturi diameter of 40mm (1. In this video we tackle the rebuild process from the carburetor cleaning to a few modifications and especially the float adjustment of a Harley Davidson CV carburetor utilizing a standard rebuild kit. Nov 20, 2020 · As to the carburetor, the Harley/Keihin CV carb, the accelerator pump doesn't just run or go. Th May 6, 2021 · CV Carb Questions & Needed Advice. Any ideas as to what I can do to solve the problem. Like any mechanical part, it can face issues over time. I think I'm remebering correctly that the se air kit for pre 04 will allow enough room to use a shorty #2 phillips or allen if you changed screws, to remove the bowl without taking the whole dang thing apart, however I've been looking at mine so much May 31, 2021 · I was changing the main jet in my new Chinese knock off CV carb on my 1991 FXSTS. Jul 19, 2024 · Troubleshooting a Harley Davidson CV carburetor need not be daunting. Hope this help you to do your own work and save $$$ Nov 11, 2018 · My bike is a 2002 Dyna. A '93 1200 would have a Keihin CV carb . Replacing the Harley fuel elbow can help guarantee a leak free carburetor, and if installing a hi-flow or CVP Fuel Max Inlet provide increased flow. Dec 1, 2016 · If you are dealing with a Keihin CV-40 carb, then the accelerator pump is very simple. Since then, all Harley-Davidson motorcycles make use of fuel injection. Jan 20, 2014 · The importance of a perfect seal where the carburetor spigot press fits to the manifold boot seal is critical. I replaced the slide( with one not drilled) , emulsion tube, needle, and went back to a stock emulsion tube and needle with a few washers and it never ran better. Armed with the right knowledge and tools, any rider can tackle common issues. Having the right tools ensures efficient repairs and maintenance. He gives his suggestions on where to start when you are having fuel delivery issues Hi, so I cleaned and rebuilt my cv carburetor on my fxdx the other day and I'm really quite confused at how to tune this thing properly. I'm thinking that it's probably the float needle but I don't know much about a CV carb. Everything is home made and DIY as usual! Jul 2, 2024 · Last spring I went through having some work done to my bike cams adjustable, push rod, cam chain, tensioner, new lifters my bike ran great and fine. Part Number 27554-99 - Carburetor rebuild kit for SCREAMIN’ EAGLE Big Bore 44 mm CV carburetor. Calling a reputable shop to see if they can do what the link says about cv carb tuning. I checked all the air bleed holes and I can get air flow through all of them. com/motorcycle-air-intake-and-fuel-systems?utm_source=youtube&utm_medium=description&utm_campaign=The_Anatomy_of This video shows stock Harley Carburetor rebuild. Harley Davidson motorcycles prior to 1989 used a standard butterfly carburetor and are excellent candidates for upgrading Mar 17, 2017 · My Question is would the needle jet barrel use the bigger needle I took out of it or is the barrel the same as my old carburetor and accept my old stock needle. I'll walk you through replacing it. No way. Here's the order we recommend tuning the circuits of the Keihin CV carburetor used on Harley Davidson models. when I noticed the emulsion tube only has 2 holes in it. Harley Davidson Sportster carburetor Fix. See Figure 4-4. Although now manufactured in Japan, its basic design reaches back quite a long way. 1. Reassembling your carburetor in great detail after cleaning or rebuilding. Once the motor is warmed up it will start right up as it Harley Davidson CV Carb. All Balls Racing Carburetor Repair Kit For Harley Sportster 2004-2006 James Gasket CV Jul 16, 2015 · I just removed the bowl from my '92 Dyna cv. Sep 21, 2020 · About this item . 1974 Suzuki GT750 Lemans (Water Buffalo) The Cv 40 carb is specifically designed for Harley-Davidson motorcycles and is commonly found in their models. To get your Harley's stock carb right, follow these instructions: l. Owning a Harley Davidson motorcycle can be an exhilarating experience, but maintenance is key to… May 24, 2012 · anyways, since the main was stuck, and the vaccumm slide is in sub-par shape and not to mention the fact the CV round-top i heard was for on-road emissions quality, i went and found a SP200 carb off an 87, its in the mail as we speak. I had this same issues before when i just had hp103 cams and thundermax. I'm here with a few questions. It is a constant velocity (CV) carburetor, which means that it automatically adjusts the fuel-air mixture based on engine speed and throttle position, providing smooth and consistent performance. I'm worried that the valve may not be seating properly and is causing the last little bit of the carb problems I inherited with my ride. May 11, 2021 · Finally sorted out the flooding CV carb, threw it in the bin. Also, if you close the petcock and run the bike till it shuts off there will still be a little gas in the bowl so be careful. A stock bike 1340cc ( 80 CID) can develop up to 64 horse power with a well tuned and modified CV carburetor. Keep riding with confidence, knowing your carburetor is in top shape. I also checked the float level, wasn't sure if the wrong float Apr 28, 2010 · I never did modify the spring by cutting a coil out. Socket Set : A comprehensive set helps remove and install various carburetor components. This diagram provides a visual representation of the various components and their connections, allowing riders and mechanics to better understand how the carburetor functions and Jul 6, 2014 · I finished replacing the upper motor mount on my 2007 Spinger Classic 96" TC converted EFI>carb (with choke bracket) and re-jetting my Keihin 40mm CV carb with 45/190 NC65 needle (no shims) and air mixture screw turned out 2-1/2 turns running a K&N high flow breather with a Thunderheader exhaust this past weekend and the bike is running Apr 2, 2012 · I've got an '89 Sportster 883 that used to run fine but has given me fits for a long time now. 79 $ 13 . The old elbow id removed and a CV-Performance brass elbow is put in its place. The CV carb is more than sufficient up to 100 HP and there's no way you're going to make an 80" hit 100 hp (at least not without some serious amount of money and work). Aug 24, 2012 · I was delayed by a rocker box leak, but I finally got it together with the new carb parts. We recommend you down load the HSR tuning books for Harley Davidson. I thought it would be helpful to some if I shared a video of how I removed and cl CV Performance helps riders like yourself achieve the full performance potential of their Harley and American V-Twin motorcycle with high quality intake products. Refer to the STICKY on elbow replacement. No problems at all. This A/F screw helps tune your motorcycle. Took carb loose and inspected carb boot, looked fine. My problem is this: I found a hose leaking fuel from my carburetor today after I had ridden it. Harley-Davidson® motorcycles equipped with some Screamin’ Eagle® high-performance engine parts may not be used on public roads and in some cases must be In this episode Custom Cez explains how does the CV carburetor works and how to adjust the mixture screw. Do I have a bad diaphragm or a clogged fuel passage>> Any thoughts would help 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. May 6, 2010 · I recently replaced the accelerator pump and enricher on my 02 sportster with a cv carb. May 29, 2015 · Hi everyone . The Harley-Davidson CV carburetor is a crucial component in the functioning of the motorcycle’s engine. CV Carburetor Rebuild Kit,CV Carb Repair Kit for Harley Davidson CV40 CV 40mm XL883 XL1200 carb engine. It looks like a 5/16th hose, which Shop the best selection of Harley-Davidson Carburetor - Parts at Dennis Kirk for the lowest prices. Common issues include erratic idling, poor acceleration, and fuel leaks. (Im new with these CV carbs please forgive ignorance. Back in the day I cut my teeth on Harley cv carbs. May 10, 2011 · Carbureted evo, twin Cam and Sportster engines can have their air/fuel mixtures corrected with one part - a stock Harley part - the needle from a 1988 or '89 1200 Sportster (HD part #27094-88). If the carb was used on several different model years the part number would stay the same so not very useful determining the year of the carb . It will fire when cold with full choke and about 6 or 8 twists of the throttle but won't stay running when I let off the starter button. Jun 26, 2019 · Buy CV Carburetor Rebuild Kit for Harley Davidson Sportster 40mm XL883 XL1200 CV40 27421-99C 27490-04 CV 40mm Carb Repair Kit 27421-99A,CV40 Rebuild Kit,CV Carb Rebuild Kit,CV Carb Jet Kit 27006-88: Carburetors - Amazon. You can get jet kits for $20-100 or just buy individual jets. By analyzing the diagram and making appropriate adjustments to the different components, motorcycle enthusiasts can achieve optimal performance and fuel efficiency. It had a Keihin retrofitted that Jun 18, 2024 · Understanding the CV carburetor involves grasping its internal mechanisms and operational principles to effectively tune your Harley Davidson bike for optimal performance. May 18, 2022 · The title of this post is copied and pasted from a YouTube video. Click here to see dyno testing on the CV against other carburetors. serial number, not model. 575 inch). I picked up one that is in good condition but came off an 89 not a 2000. Properly tuned, a CV carburetor is capable of supporting 80+ horse power in modified engines. All my fittings from the gas tank all the way to the carb are snug and dry. However, the air bleed hole sizes are different on fixed-venturi carburetors, and they must not be installed on CV carburetors. May be a bunch of crud, or the existing diaphragm may be damaged (wear). First month I owned it, V&H pipes were installed and the carb was rejetted and air cleaner replaced with a K&N. Drive that thing. There's no need for an elaborate kit or to make extensive modifications to the stock Keihin CV carb. is Y74A FJ17. This was actually in reference to an early style 3 sided valve that had been used on the earlier Keihin butterfly carburetors. Expert carb tuners are folk heroes and sought after even as EFI machines are now standard. Nov 30, 2012 · Hi, I'm new to the forums, and fairly new at working on motorcycles, but a decent shade-tree mechanic. Understanding the Harley-Davidson CV Carburetor: A Comprehensive Diagram. Generally you start at 1-3/8 to 2 turns out or something. OK got the brass tube out. In the case of this carb, the fuel inlet was plastic. Note that while working on the carburetor or any fuel system, care should be taken to keep away from any open flame or heat source. Jun 19, 2010 · The knob moves ok with the adjuster most of the way off, and moves easily with the nut removed. Dealer said carb is beat, wanted to sell me an aftermarket carb, $450. I've had the carb off, but have not taken the top cover off. CV Carburetor Modifying the CV carb Tuning a CV carb Camshafts Selecting a cam Install a TC 88/95 cam Install a Big Twin cam Install Sportster cams Camshaft Specifications Twin Cam EVO Shovel XL Exhaust Systems EVO Exhaust Testing TC Exhaust Testing Khrome Werks AR100 test Making Drag Pipes Work: SHOP TALK Shop Manual Carburetor Carburetor Bob’s at the bench with your Harley carburetor troubleshooting questions. The bike now has only 18k miles on it, but its starting to sputter, backfire, both through the carb AND occasionally through the exhaust. May 22, 2013 · The air screw, will only effect idle mixture,(so slight at any other throttle setting as not to be a concern), so unless you have a flat spot off idle,ie it spits and or farts when you open the throttle, then there's little to be gained from adjusting the idle screw. its the T top version of the mikuni carb. Identify Common Issues: Recognize typical carburetor problems, such as fuel leaks, clogged jets, and incorrect air-fuel mixtures, which can affect performance. ufx dvcck irlrs tzno mbqs qeparqe rejdn qpeyh euk hxkpgxr shs taee igwu smbq dywh