Donny Petersen 
Donny’S Unauthorized Technical Guide to Harley-Davidson, 1936 to Present 
Volume V: Part Ii of Ii—The Shovelhead: 1966 to 1985

In this second part of his fifth volume on Harley-Davidsons motorcycles, Donny Petersen, who studied privately with Harley-Davidson engineers, shares practical knowledge and streetwise tips on the Shovelhead motorcycle.Donny presents what Harley-Davidson has to say through the myriad of service bulletins back in the day in everyday language. He also uses his extensive practical experience to constructively critique the official line, offers additional hard-earned information, and then shares what he does to his own bikes. He provides solutions to fix the Shovelheads teething problems; Harleys responses to ongoing problematic aspects of vibration, as well as the aftermarkets cures; tips on working with the Shovelheads carburetors and five ignitions; starter and charging systems, electrical switches, circuit breakers, and relays; and best practices for lubrication, as well as the progression of front forks and shocks, brakes, wheels, and tires.Written in straightforward language, this guide offers step-by-step instructions to help all levels of enthusiasts, from novices to expert mechanics. In his usual forthright manner, Donny makes technical issues understandable, interspersing explanations with entertaining stories about the lifestyle that comes with being a Harley rider.

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Donny Petersen established and operated Heavy Duty Cycles in Canada from 1974 to 2010; his monthly column, “Techline, ” has appeared in American Iron Magazine since 1992. Instructed privately by Harley-Davidson engineers, he has taught mechanics, designed tech-school curricula, and authored mechanic-licensing examinations. He lives in Toronto.