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Description
Donny's Unauthorized Technical Guide to Harley Davidson 1936 to Present: Volume II: Performancing the Twin CAMDonny 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
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 Present. This twelve-volume series by the dean of motorcycle technology examines the theory, design, and practical aspects of Twin Cam performance.Donny studied privately with Harley-Davidson engineers, having worked on Harleys for over 35 years. He founded Toronto's Heavy Duty Cycles in 1974, North America's premier motorcycle shop. Donny has ridden hundreds of performanced Shovels, Evos, and Twin Cams across four continents doing all of his own roadside repairs. He has acquired his practical knowledge the hard way. Donny has the privilege of sharing his performance secrets the easy way. Donny will walk you through detailed performancing procedures like headwork, turbo-supercharging, nitrous, big-inch Harleys and completing simple hop-up procedures like air breathers, exhausts, and ignition modifications. Donny Petersen feels honored to share the wealth of his motorcycle knowledge and technical expertise.
Binding Type: Hardcover
Publisher: iUniverse
Published: 12/24/2008
ISBN: 9780595515165
Pages: 740
Weight: 2.71lbs
Size: 9.00h x 6.00w x 1.75d
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4.6 ★★★★★
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Product Reviews
★★★★★ 5
It's not cloth but Nomex.
Size: 8.5, Color: Black
It's not cloth but Nomex.
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Reviewed in the United States on September 17, 2020
★★★★★ 3
Light and comfortable, didn't hold up for a full season
Size: 11.5, Color: Black
Pros:boots were extremely light and comfortable.
Cons: if you work in rocky areas like northern California you will only get 1/2-1 season on these. Mine lasted 6 months then the fabric ripped, the soles had holes all the way through to the middle, and the tread wore down til they were smooth slick rubber.
If they cost $150-$175 I'd buy 2 pairs a season but at over $300 a pair there are much better options
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Reviewed in the United States on July 11, 2021
★★★★★ 1
True advertisement
Size: 11, Color: Black
I just purchased these boots 09/03/25 , let's see what these reviews are about? Why isn't their a direct website for the company? Quality and Durability.
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Reviewed in the United States on September 5, 2025
★★★★★ 4
Nice boot!!
Size: 8.5, Color: Black
Very comfortable. Built well and obviously high quality. Fits a little big, about a size larger. They are a little thinner/cooler than the Danner Wildland and Haix Missoula. They do not have any NFPA rated tags or labels on the boot. Will upgrade the laces. Would love to see the boa system on this boot!
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Reviewed in the United States on January 2, 2020
★★★★★ 2
Needs work
Size: 12, Color: Black
I’m disappointed that I spent almost 400$ on a pair of boots and wore them for 3 days and both boot laces broke near the eyelets. As a wildland firefighter I need to be able to rely on my boots.
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Reviewed in the United States on November 6, 2020