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The "EZ-Just ©" idle mixture needle for Keihin carburetors

These products (AMC400-764 and AMC400-765) are designed to be used on Keihin CVK40 (CV) and Keihin butterfly carburetors used on Harley Davidson. The AMC400-765 is specifically designed for use on the Keihin butterfly carburetors used on Harley Davidson (HD) motorcycles and the AMC400764 was specifically designed for the Keihin CVK40 (CV) carburetors used on Harley Davidson motorcycles. I cannot guarantee that it will work on other than the Harley Davidson CV carburetors. The following steps outline the procedure for installing the Keihin Constant Velocity (CV) and Butterfly (BF) "EZ-Just ©" idle mixture needle screws. We suggest having the appropriate service manual available for reference. 1. Following the proper service manual, remove the carburetor from your motorcycle. 2. Locate the soft aluminum plug that seals the idle mixture adjustment needle screw. On the CV carburetor, it is on the bottom toward the spigot end of the carburetor. On the BF carburetor, it is located on the top toward the flange end. Note: The plug may have been removed in order to tune or rebuild the carburetor. If so, proceed to step 5. 3. This step requires a 1/8" drill and short self-tapping sheet metal screw. Drill into the plug approximately 1/8-1/4". Be very careful not to go to deep and damage the needle screw. 4. Screw the sheet metal screw into the hole in the plug. Pull the plug and screw out together with a pair of pliers. 5. With a small flat bladed screwdriver, remove the idle mixture needle. CAUTION! There is a spring, washer and o-ring under the needle! Do not loose these! If they are missing, order my repacking kit AMC401-340 6. Install the new needle into the carburetor make sure the spring, washer and o-ring are installed correctly! 7. Turn the needle in until it gently seats. Then, back out 1 ½ turns. This establishes a starting point for final adjustment. 8. Following the service manual, reinstall the carburetor. 9. After installing the carburetor, check for fuel leaks. 10. Start the engine and warm up to operating temperature. 11. Adjust the idle mixture for proper engine operation. Turning the needle in leans the mixture. Turning it out richens the mixture. Note: In most states require that the idle mixture be set to a standard. The adjustable needle is meant to allow you to adjust your idle mixture properly. Failure to do so will violate state and federal law and will loose warenty rights.

Copyright Johns Motorcycle parts 2007 all rights reserved Aldra HD Shop

Aldra HD Shop

www.aldra.ch

[email protected]

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