Peugeot 103. Just threw on a 70cc cast-iron polini kit, vintage italian import (thanks kirk for the deal), and I bolted on my mildly decked stock 50cc head and the piston seems to be hitting the head and not turning over. I didn't have this problem with the other one. I even threw two aluminum gaskets on, to no avail.
I'm cutting several more gaskets now to raise it a bit more. Does anyone have experience with 70cc pistons interfering with a decked 50cc head?
fyi- I tried putting a 50cc high comp head on my stock 50cc cylinder once, and the piston hit that too.... is it possible I've got some other problem?