Donny Petersen offers workable solutions for whatever ails your 1999 to present Harley-Davidson. Graphics, pictures, and charts guide the reader on a sure-footed journey to a thorough H-D Twin Cam understanding. Petersen’s insight makes technical issues understandable even to the motorcycle novice. In easy-to-understand language, Donny examines what’s right, what’s wrong, what’s “just okay” about the Twin Cam power train. This is the first volume of Petersen’s long (more…)

The Harley-Davidson, one of the world’s most celebrated motorcycles, is explored in this comprehensive guide, from its humble beginnings to the incredible American icon it has become today.

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Donny Petersen offers the real deal in performancing your Harley-Davidson Twin Cam. Graphics, pictures, and charts guide the reader on a sure-footed journey to a thorough H-D Twin Cam performance understanding. Petersen’s insight makes technical issues understandable even for the novice. Donny simply explains what unfailingly works in performancing the Twin Cam. This is the second volume of Petersen’s long-awaited Donny’s Unauthorized Technical Guide to Harley Davidson 1936 to Pres (more…)

Valuable information on Harley-Davidson motorcycles, including the Sportster, the Shovelhead- and Evolution-engined bikes, as well as competition, police, Aermacchi, and Buell models. Packed with information on where and how to find these machines, how to identify rare models, and how to figure out what your machine is worth. Girdler offers a mini-history of each model, and explains why the model exists and what its role was in Harley-Davidson’s line-up. Covers all models built 1965-9 (more…)

Valuable information on Harley-Davidson motorcycles, including the Sportster, the Shovelhead- and Evolution-engined bikes, as well as competition, police, Aermacchi, and Buell models. Packed with information on where and how to find these machines, how to identify rare models, and how to figure out what your machine is worth. Girdler offers a mini-history of each model, and explains why the model exists and what its role was in Harley-Davidson’s line-up. Covers all models built 1965-9 (more…)