I would definitely prefer to start with a complete engine and do a tear down/ rebuild. But I cannot seem to find any for sale. The market dried up.
Since nobody said it’s stupid hard, I’ll check out the diagram and make a parts list. If it goes well above the price of a moped with complete engine (which is likely) maybe I’ll have to go that route.
Funny how that works.
I found a Puch in Austria that has a two speed with twist shift. At least that’s what it looks like from the pics. Didn’t translate. But I can’t go there if I wanted it.
Thanks for the info.