Use compressed air to clear the passages.Do not allow any cleaning fluid to come in contact with the slide diaphragm (remove if needed) or the mixture screw o-ring. Spray a small amount of mild carburetor or fuel injection cleaner into the pilot jet passage and mixture screw passage.Remove the mixture screw, spring, washer, and o-ring.Dirt or old fuel that has become lacquer will clog these passages causing hesitation or lean popping.Ĭleaning the idle circuit passages requires compressed air. Inside the CV carburetor there are a series of tiny passages connecting the mixture screw, pilot jet, and air intake jet located on the front face of the carburetor (pictured below). If your needle jet is missing or worn CVP carries new needle jets.ģ) Clogged idle mixture circuit. Installing the jet upside down will adversely impact the fuel spray and needle metering.
The CV carb is dependent upon vacuum to function properly.Ģ) Check that the Needle Jet (nozzle) is installed correctly. DO NOT PERFORM THIS NEAR AN OPEN FLAME.Īgain it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS. If there is a vacuum leak the gas will be drawn into the leak and cause the engine RPM to slow or fluctuate. To test for a vacuum leak, use a propane torch (unlit) and wave the gas around the manifold area while the engine idles. The boot seal must be replaced periodically. 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. The smallest leak will have a big impact on performance, throw off jetting (require larger jets), and directly affect the mixture screw setting. The importance of a perfect seal where the carburetor spigot press fits to the manifold boot seal is critical. If troubleshooting a 2004-2006 model be sure to check the Diagnostic Trouble Codes (DTC) first to troubleshoot any sensor issues.ġ) The #1 cause of hesitation and performance issues following a carburetor rebuild or install is VACUUM LEAKS. When installing a rebuild kit (OEM, no instructions) consult your factory service manual for instructions. Please refer to your installation instructions included with all CVP Tuners Kits. The following are common issues sometimes encountered after tuning or rebuilding a Harley CV carburetor. Hesitation or stalling can sometimes occur after tuning or rebuilding your Harley CV carburetor or if your Harley carb has not been maintained. Harley CV Carburetor Tuning Issues & Troubleshooting
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