1986 Sportster was dumping gas out of the carburetor when idling. Someone had decided to do some drilling on the carb at some point, totally ruining it. This slick little kit includes everything you need to change out your stock carb for a much, much better one. The only part I had trouble with was the factory flanges on the intake. With the new intake I had to slightly widen the holes so the bolts would start in the heads correctly. Other than that, it's a breeze to install and adjust.