This new book from Wolfgang Publications shows, in great detail, the how and why of performance engine building.

Harley-Davidson EVO, Hop-Up & Rebuild Manual, is a must-have for anyone who wants to put wrench to an EVO V-Twin. Each section covers a specific subassembly. If you're a DIY rider or shop owner this is the book you need.

Donny is the Winner of the 2012 International Book Awards. 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.

Complete coverage for your Harley-Davidson Twin Cam 88, 96 and 103 Models 1999 to 2010 Routine Maintenance and servicing Tune-up procedures Engine, clutch and transmission repair Cooling system Fuel and exhaust Ignition and electrical systems Brakes, wheels and tires Steering, suspension and final drive Frame and bodywork Wiring diagrams Reference Section With a Haynes manual, you can do it yourself...from simple maintenance to basic repairs. Haynes writes every book based on a complete teardown of the motorcycle. We learn the best ways to do a job and that makes it quicker, easier and cheaper for you. Our books have clear instructions and hundreds of photographs that show each step. Whether you're a beginner or a pro, you can save big with Haynes! Step-by-step procedures Easy-to-follow photos Complete troubleshooting section Valuable short cuts Model history and pre-ride checks in color Color spark plug diagnosis and wiring diagrams Tools and workshop tips section in color

For anyone planning to get a little--or a lot--more power from their Twin Cam, this book presents combinations of parts that work together to provide the maximum power for the least amount of money.

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.