http://www.mopedarmy.com/wiki/Rebuild_a_Puch_E50_Engine
^^ how accurate is this in the port matching area? this is the kind of work i was expecting. I hadn't planned on there being much more (for an 80cc kit) than boring the case out to match the cylinder (which i was going to get done at a machine shop). as far as the matching goes, I was going to take my time and hand file all of it.