Here’s an episode of Discovery Channels “Greatest ever motorcycles” about the legendary Harley Davidson Knucklehead. The knucklehead engine was first introduced in 1936 and the knucklehead powered harleys was probably some of the first to undergo the chopping treatment. They’re pretty rare today, but you see them once in a while, either as beautiful restoration jobs or old school choppers. Either way, you can be sure it holds a high position in the owners heart. Wise cracks would go “yea, when it’s running”, obviously they’ve missed the point in owning a true classic.