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 horsepower over torque, the usual approach, makes for a difficult ride. Author Bill Rook has spent decades perfecting the art of building torque-monster V-twin Harley engines. Here he brings that experience to bear, guiding motorcycle enthusiasts through the modifications that make a bike not just fast but comfortable to ride. With clear, step-by-step instructions, his book shows readers how to get high performance out of their Harleys--and enjoy them, too.

Do you want to make your Harley-Davidson run faster? Author Donny Petersen, with more than forty years of experience working on and designing Harleys, shows you how to make anything from mild to wild enhancements to your bike. He progresses from inexpensive power increases to every level of increased torque and horsepower. With graphics, pictures, and charts, Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present offers the real deal in performancing your Harley-Davidson Evolution and guides you on a sure-footed journey to a thorough H-D Evolution performance understanding. This volume examines the theory, design, and practical aspects of Evolution performance; provides insight into technical issues; and explains what works and what doesn't in performancing the Evolution. He walks you through detailed procedures such as headwork, turbo-supercharging, nitrous, big-inch Harleys, and completing simple hop-up procedures like air breathers, exhausts, and ignition modifications. In easy-to-understand terms, Donny's Unauthorized Technical Guide to Harley-Davidson, 1936 to Present shares performance secrets and provides clear guidance into what works, what does not, and what's just okay with performancing the Harley Evolution power train.

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Keep a veteran mechanic at hand with this updated version of the best-selling manual for Harley-Davidson owners who want to hop up their machines. Created with the weekend mechanic in mind, this comprehensive, illustrated guide clearly and concisely outlines 101 projects that will improve the power, handling, and ride of Evolution-engined Harley-Davidson motorcycles. Drawing on years of hopping up and living with Evo-engined Big Twins and Sportsters, author and Harley-Davidson technician Kip Woodring provides step-by-step instructions for projects ranging from the basics of simple maintenance to the finer points of altering gearing, upgrading ignition, and making the changes that make a bike unique.