Carburetors have been around in one form or another since before Henry Ford rolled out the first Model T, so why haven't we figured them out yet? At its core, a carburetor is simply a metered air leak ...

Harley-Davidson has used the 40mm Keihin constant velocity (CV) carburetor since 1988 on Sportsters and introduced them in 1990 on the Big Twins. The 1988 model differed from the 1989-and-later carbs ...