Re: 1960 Lark II as parts source for 1964 40hp?

[amuller]

quote Chris_P:

Ive done so much swapping my memory is fuzzy, but I believe the drive shafts are the issue with that swap. If I remember correct, swapping the drive shaft will allow you to swap the gearcase. Everything else is fine. I cannot remember what was different, perhaps the length? Someone will chime in with exactly why.

Am I correct that this would have the small crank taper and the flywheel nut had to be highly torqued to stay on?

I’ve seen some complex discussions of shaft differences on these big twin motors. Something about how the weigh of the shaft is supported/end play controlled? In my case I would probably want to use shaft and gearcase together to get a 20" transom motor.