Frank, what does the ” the update kit is part #580871.” consist of? a whole new mag plate? or just the brass insert ? Is any machining work needed for truing a worn boss on the crank case?
Joe B
This picture is only part of the kit. The kit also includes a different mag plate. The new mag plate no longer has the brass insert that rides on the crankcase neck. Instead, the kit includes a hard-coat part #12 which takes the place of the brass insert. #12 is taller than the old brass insert, so it extends down onto unworn portion of the crankcase neck. Next goes #10 which replaces the old mounting ring. On top of that, goes #30 which is a hard-coat ring. Finally, the new mag plate. The kit also includes a ground wire, which is important because the hard-coat is non-conductive. This stuff is all shown on the 1971 40hp parts book, and some others.
I have the service bulletin, if I can find it.
No modification of the crankcase neck is necessary.
