When to tune a Harley Davidson CV carburetor?
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. Always start with a fresh set of spark plugs when tuning. The carburetor will need to be removed from the manifold so refer to your factory shop manual for this procedure.
What should I use to clean my CV carburetor?
Spray a small amount of mild carburetor or fuel injection cleaner into the pilot jet passage and mixture screw passage. Do not allow any cleaning fluid to come in contact with the slide diaphragm (remove if needed) or the mixture screw o-ring. Use compressed air to clear the passages.
What kind of screwdriver to use for CV carburetor?
The carburetor is not as lean as the factory settings. DO NOT follow the owner’s manual directions for cold starting. A small, flat blade screwdriver about 3″ long should be used to adjust the idle mixture screw. Fumbling around with the wrong screwdriver usually results in burned knuckles.
What kind of carburetor does a Harley Davidson use?
Harley Davidson motorcycles prior to 1989 used a standard butterfly carburetor and are excellent candidates for upgrading to the newer CV carburetor. The upgrade is quite straight forward and for the majority of models only requires a Flange Adapter be fitted between the carb and the manifold.
Which is the best CV carburetor for a Harley Davidson?
The stock CV carburetor when properly tuned delivers more than adequate performance to any stock or slightly modified Harley while still maintaining good gas mileage. A Harley CV carburetor by far outperforms it’s butterfly style predecessors, namely the Keihin, Zenith, and Bendix.
Can a CV carb be used on a stock carb?
That is not to say that you cannot use one of those carburetors on your daily stock ride, but the hidden performance in the CV carb you already have may surprise you. For years builders have opted for the larger aftermarket carburetors with the belief that bigger is better.
When to upgrade the carburetor on a Harley Davidson?
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 . 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 .
Spray a small amount of mild carburetor or fuel injection cleaner into the pilot jet passage and mixture screw passage. Do not allow any cleaning fluid to come in contact with the slide diaphragm (remove if needed) or the mixture screw o-ring. Use compressed air to clear the passages.
Where is the mixture screw on a Harley CV carburetor?
The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). The tower is plugged with a soft metal insert covering the mixture screw. Gaining access to this screw is key to fine tuning and must be remove.
Why is my CV carb not working on my Harley?
Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS. The CV carb is dependent upon vacuum to function properly. 2) Check that the Needle Jet (nozzle) is installed correctly.
What kind of CARB does a Harley Davidson Sportster have?
Make sure this fits by entering your model number. Fits for Harley-Davidson XL1200C Sportster 1200 Custom 1998-2006; XL1200L Sportster 1200 Low 2006; XL1200R Sportster 1200 Roadster 2004-2006; XL1200S Sportster 1200 Sport 1998-2003
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. Always start with a fresh set of spark plugs when tuning. The carburetor will need to be removed from the manifold so refer to your factory shop manual for this procedure.
The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). The tower is plugged with a soft metal insert covering the mixture screw. Gaining access to this screw is key to fine tuning and must be remove.
Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS. The CV carb is dependent upon vacuum to function properly. 2) Check that the Needle Jet (nozzle) is installed correctly.
Make sure this fits by entering your model number. Fits for Harley-Davidson XL1200C Sportster 1200 Custom 1998-2006; XL1200L Sportster 1200 Low 2006; XL1200R Sportster 1200 Roadster 2004-2006; XL1200S Sportster 1200 Sport 1998-2003