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 ...
Carb tuning is a familiar procedure to old racers, something practiced from an early age, when anyone with a good ear and a screwdriver would put a tune to their wheels on a Saturday afternoon. These ...
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