Motorcycle Glossary Dictionary Term - Knucklehead Knucklehead: Knucklehead is the name of the Harley-Davidson engine used from 1936-1947. If you sit on the seat of a knucklehead machine and look down to the right side of the engine, the rocker box looks like the knuckles on your fist. Check out the Harley-Davidson site to see pictures of their engines.
Symbols, A - C: (2-Second Rule => Custom Motorcycles)
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© 2015 Walter F. Kern. All rights reserved.
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