Harley-Davidson created a bike with a 61 cu in. overhead valve engine in 1931. What is this model of bike called?
Answer Knucklehead
The Knucklehead is a must-have for Harley-Davidson collectors. The company only made a little over 9,000 of these rare bikes.
Asked by Mike Bedard · Last updated 5 years ago · 205.9K views · SOURCE
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