9) Worn float fuel valve. Check that fuel sprays from the accelerator pump nozzle when rolling on the throttle (test with engine off). 6) Over-drilled slide port. L1ability Accident Prone. The rubber components inside can fail and the ports and passages within the carburetor body can become clogged.
The size of this hole can adversely effect the position and rate of travel of the slide.
If troubleshooting a 2004-2006 model be sure to check the Diagnostic Trouble Codes (DTC) first to troubleshoot any sensor issues. Applying a small amount of silicone grease to the inside of the manifold boot and making sure the carburetor presses firmly into the boot often cures most problems. As a manufacturer and supplier we are unable to provide telephone technical support. If you have a vacuum-operated choke, then you may have a vacuum leak in the hose, or a bad vacuum motor. If the rubber valve tip becomes worn the carburetor is prone to flooding. We are unable to provide technical assistance or troubleshoot repair conditions including ignition, electrical, engine issues, or provide advice on installing products under non standard applications (Shovelheads, non-Harleys, etc). I only replaced the bad one and am keeping the new spare as a spare. If the slide diaphragm becomes pinched or is unable to seal, the slide will not function correctly.
You can use a 1/8 drill bit as a gauge to check the vacuum port hole size. Spray a small amount of mild carburetor or fuel injection cleaner into the pilot jet passage and mixture screw passage. Ridding to work today it seems to have lost all topend power. Privacy Policy, Credit Cards AmexDiscoverMasterCardVisa Jerky acceleration.
This was later found to harm performance and cause erratic behavior as the slide attempted to bounce and search for correct positioning. When in doubt consult your factory service manual and/or a professional motorcycle technician. arrangement on this Website are all subject to copyright and other 4) Accelerator pump weak or not spraying.
editorial purposes only, and to the benefit of the trademark owner, with no text, images, graphics, sound files, animation files, video files, and their intention of infringement of the trademark. At to about 1/4 throttle you can't tell anythings wrong, but crack it and you go nowhere fast. The CV carb is dependent upon vacuum to function properly. I would expect both slides to act more or less the same. Replace the gas cap as needed. The maximum recommended hole size for the slide port should never exceed 7/64".
Modified pipes and removing the baffles will also impact performance regardless of how a carburetor is tuned. This will cause more fuel to enter the venturi, causing the rich condition, and may be accompanied by fuel leaking from the carburetor atmospheric bowl vent.
check out the. With a punctured diaphragm, the slide won't lift and the bike won't pull more than roughly 3000 RPM. You need to be a member in order to leave a comment. 31st March - 2nd April 2017, Hograost North 2017, Buxton Derbyshire. To test for a vacuum leak, use a propane torch (unlit) and wave the gas around the manifold area while the engine idles. Members attending any such event do so at their own risk. The topics on this page are meant as recommendations or a guide only and are not a substitute for the advice from a qualified repair technician. 5.
At WOT very sluggish. Air should come out of the air intake jet shown in the picture. Refer to #3 if fuel has been allowed to sit in a carburetor for extended periods of time. These objects may not be copied for
Unfortunately those articles with the 1/8" recommendations are still widely published or found online and unsuspecting Harley owners perform that modification damaging the vacuum slide. For several years many articles and companies promoted the practice of drilling the slide using a 1/8" drill bit. Had a Buddy with a similar problem and filter was clogged.
All depends on how much of a vacuum it can hold. Stumbles and intakes sneezes that only occur when accelerating aggressively are indicative of a damaged accelerator pump diaphragm or clogged accelerator pump passages.
truth and equality for all. Copyright 2020 Leaf Group Ltd. / Leaf Group Media. 6. Thanks for the vid. However, if the problem only manifests itself on cold starts, then the problem most likely lies with the choke or enrichener circuit. Diaphragm cap loose, damaged or leaking. Symptoms of a Bad Carburetor ... Constant-velocity carburetors can deliver poor mid-range performance if the carburetor slide diaphragm is damaged and leaking.
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I will compare it to the action on mine. My Keihin CVK 40 carb still seems wonky after a clean & retweak earlier this week.
Ordered the Diaphragm Gasket kit, speedy delivery, dismantled the carb, gave it a good dose of carb cleaner and fitted the new gaskets, hey presto, started first time, job done.
CV carb is dependent upon vacuum to function properly.
The boot seal must be replaced periodically.
Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS. 8) Gas cap venting. Never attempt to tune an engine with fuel that has sat for more than 3 months. Easy to check, remove airtubes and look to see if slides lift.
The vacuum leak will prevent the slide from opening fully, and it will artificially limit the operating range of the carburetor.
Please refer to your installation instructions included with all CVP Tuners Kits. The The following are common issues sometimes encountered after tuning or rebuilding a Harley CV carburetor. Restrictions in the fuel filter or fuel lines can also mimic the symptoms of a clogged carburetor. Remove the mixture screw, spring, washer, and o-ring. Frequently Asked Questions (FAQ) The smallest leak will have a big impact on performance, throw off jetting (require larger jets), and directly affect the mixture screw setting. CV carb issue, cant get it to run nicely. I'm thinking the slide diaphram has a hole in it. Gasoline that is old or left to sit in the tank or fuel system will change over time, often becoming lacquer and clogging small passages. Do not allow any cleaning fluid to come in contact with the slide diaphragm (remove if needed) or the mixture screw o-ring.
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