From four-speed Evos to five-speed Buells, this book is the Bible for Sportster performance. Whether your intent is to improve the existing factory parts or ins

Donny is the Winner of the 2012 International Book Awards. Donny Petersen offers the real deal in performancing your Harley-Davidson Twin Cam. Graphics, picture

For Harley-Davidson aficionados, the very name Sportster conjures an image of a fire-breathing mechanical beast scorching the world’s tarmacan image the Sport

Many people modify their Harley-Davidson engines--and find the results disappointing. What they might not know--and what this book teaches--is that emphasizing