Some stories are so obvious and necessary that it's difficult to identify the need. Surely everybody knows what a Q-jet looks like and how to tell it apart from an old Carter or a Holley 4150. "Not so ...

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 ...