Donny Petersen 
Donny’S Unauthorized Technical Guide to Harley-Davidson, 1936 to Present 
Volume Iv: Performancing the Evolution

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, Donnys 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 doesnt 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, Donnys Unauthorized Technical Guide to Harley-Davidson, 1936 to Present shares performance secrets and provides clear guidance into what works, what does not, and whats just okay with performancing the Harley Evolution power train.

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Donny Petersen established and operated Heavy Duty Cycles in Canada from 1974 to 2009. His monthly column Techline has appeared in American Iron Magazine since 1992. Instructed privately by Harley-Davidson engineers, Petersen has taught mechanics, designed tech-school curricula, and authored student-licensing examinations. He lives in Toronto, Ontario, Canada. This is Petersen’s seventh book.