And this is a brief acount ( from " popular Mechanics" about how Larsen dealt with the drive issue:
This engine is turned through 90 degrees from its usual longitudinal home. In a bike, the engine turns a primary-drive sprocket so the stubby end of the crank is not even machined to take a conventional flywheel. Larsen's solution is to take off the engine's drive with an innovative drive plate and compensating system that removes vibration and harshness. His design separates the clutch and flywheel assembly from the engine, and the drive goes straight into a Borg Warner T5 manual five-speed gearbox. The conventional propshaft runs diagonally back across the frame and into a cast-aluminum, bevel-drive rear end from a Honda Goldwing motorcycle. "
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