Prototype 6a, 6b

This bike is very close to a production MK1. The differences are: The tires have a different tread pattern. The carb is mounted at an angle probably to gain clearance for the air filter. There is what looks like a spark arrestor on the muffler. It has a black shift knob instead of wood. The clutch cover does not have a screen to allow air cooling of the fluid drive. The kickstand is on the wrong side.