Harley CV Carburetor Tuning Issues (2014)

Hesitation or stalling after tuning or rebuilding Harley CV carburetor.

The following are common issues sometimes encountered after tuning or rebuilding a Harley CV carburetor. Please refer to your installation instructions included with all CVP Tuners Kits. When installing a rebuild kit (OEM, no instructions) consult your factory service manual for instructions.

If troubleshooting a 2004-2006 model be sure to check the Diagnostic Trouble Codes (PTC) first.

1) The #1 cause of hesitation and performance issues following a carburetor rebuild or install is VACUUM LEAKS. The importance of a perfect seal where the carburetor spigot press fits to the manifold boot seal is critical. The smallest leak will have a big impact on performance, throw off jetting (require larger jets), and directly affect the mixture screw setting. 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.

To test for a vacuum leak, use a propane torch (unlit) and wave the gas around the manifold area while the engine idles. If there is a vacuum leak the gas will be drawn into the leak and cause the engine RPMto slow or fluctuate. DO NOT PERFORM THIS NEAR AN OPEN FLAME.

Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other VTwin motorcycle is VACUUM LEAKS
2) Checkthatthe needle jet (nozzle) is installed correctly. Installing the jet upside down will adversely impact the fuel spray and needle metering.

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