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 install something from the aftermarket, author Kip Woodring explains not just which parts to buy, but why. Fourteen chapters cover: History, Planning, Exhaust, Induction, Ignition, Charging and Starting, Gearing, Valvetrain, Cams, Heads, Cylinders and Pistons, Flywheels, Oil, Transmissions and Clutches.Not just another hop-up manual, the Sportster/Buell Engine Hop Up Guide includes an in-depth analysis of important topics left out of other books. Issues like oil and oil friction, combustion-chamber design, camshaft trade-offs, valvegear weight and much more.Well illustrated, this black & white Sportster/Buell book from Wolfgang Publications includes over 200 illustrations on 144 pages.