All right. After closer inspection it turns out someone's been trying to run a almost complete -71 gearbox with the exception that the shift-cam/drum is from -72. And from what I can tell; what differs between the -71 and the -72 gearboxes are just the shift-cam or shift-drum, the 1st gear-wheel and the main axle.
The 1st gear-wheel from -71 has 31 teeth, while the later one has 32. It's the same with the axles, of course. Is this why the shift-drums/cams are different as well?
Do you know what differs; since the shift-forks are all the same no matter what year.
But most important, since I've got another spare-motor, can I run a complete gearbox from -72, with different 1st gear, different axle and different shift-drum assembly in my -71 crankcase, and make that work? Or will I have to get hold of a real -71 shift-drum assembly?
Sincerely,
Felle