One of the large problems with the Parallel-twin are the main bearings. They are not the actual problem but they tend to fail after a while. The crankshaft is pushed against the bearing flange on either side of the casings during acceleration or deceleration and are easy to wear out. This “shifting” in forces is caused by the primary drive’s helical gears. To get rid of these forces straight cut gears are in order but unfortunately the Parallel Twin was never equipped with that . . . . . . so now it is time to start experimenting ! Together with a dry clutch here are the results so far.
At this point we found out that we could not use some standard gears, it didn’t fit like it should and an easy alternative is not available. So for now we are postponing the straight cut gears and get on with other projects to solve the engine problems.