If requiring an upgrade to a dual cable system there are several sources to do so including the dealer or Though many have used the CV carb using a single cable the chance of the throttle not closing due to the cable binding makes this a risk not worth taking.
Mid to pre 70?s bikes used a single throttle cable configuration which should be upgraded. Total conversion shouldn’t cost more than 200 bucks… less if you can find a buddy with a spare CV carb in good condition.Ī CV carb also requires the use of a dual throttle cable system where one cable operates the throttle (open) action and the other cable functions as the idle action in closing the same throttle. Pre-1989 Harley’s used a two bolt flanged manifold, whereas a CV carburetor simply slips onto a rubber boot and is held in place by the air cleaner’s backing plate. 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. Harley Davidson motorcycles prior to 1989 used a standard butterfly carburetor and are excellent candidates for upgrading to the newer CV carburetor. This brings us to the subject of upgrading these older Harley “Soup Cans” to the newer CV style carb. 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.Ī Harley CV carburetor by far outperforms it’s butterfly style predecessors, namely the Keihin, Zenith, and Bendix.
Due to the CV carburetor’s stable metering characteristics, Harley then commissioned their own version to replace the aging butterfly style carburetors. Modifications to this reliable carb continue today in the form of race tuner kits, hybrid slides, and Stage 1 Kits. This ingenious design is believed to have been developed by racers who altered British made carburetors and was eventually put into production by Keihin. The slide also holds a needle that when lifted by the opening slide varies the amount of atomized fuel delivered. A CV carburetor (Constant Velocity) incorporates a vacuum operated slide that varies the venturi size within the carburetor, thus maintaining a constant velocity. Harley Davidson started equipping models with the CV carburetor in 1989 and has utilized the same carb ever since.
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