Not too long ago someone gave me a P-200 that he says has a Pinasco 225 top end. The frame is shot but the engine seem to be in pretty good shape. I took the cylinder head off and the top end looks brand new. No carbon build up, no blowback, no signs of a seize. I have been able to find very little info on this top end. The piston only has one ring.
Can anybody fill me in? Are parts (rings) still available? BTW, the bike was an 80’s American p with oil injection.