Check out this insane video about John Britten. He made a complete sportbike, including forging his own pistons and cases, manufacturing his own frame and even designed his own cantilever front suspension to race in the Superbike class. This all took place in the lates 90's where he won a ton of races including Daytona. An interesting movie and a tribute to a real craftsman. Unfortunately John Britten died in 1995 due to cancer. his memory lives on through these movies and the sportbike community.