BobWard wrote:It looks like the primary chain is sitting on the bottom of the case so if the chain is that slack it’s walked over the crank sprocket and rammed the front of the case out. Has the gearbox moved forward on its mounts and the drive chain gone tight ? Bob.
I was wondering about that as it does look slack. It could have become slack after the un-diagnosed violence but we will never know. I think that if the chain was slack it would have made some noises to give warning and at the time it was running like a Swiss watch with no nasty sounds and the engine was not under great load as I was coming down a three mile gentle hill. The grinding sound and case cracking was almost instant.