Originally Posted by
fdjizm
Pinches work fine if they were done right.
I would say pre-heat the engine with a heat gun before trying to start it, and avoid turning it cold by hand. it needs to break in just like a normal engine, heat cycle or whatever you like, just go easy on it till you feel the pinch getting looser.
Thanks for the reply
I have given up on this p&s set for now. I ran it for about 4 tanks easily and the pinch at operating temps is still way too tight. The engine doesnt seem very happy.
Anyways, i put another (what looks) slightly used P&S set in the engine that the guy included as a spare. It still has great pinch at TDC, so im going to give it a try.
The guy says he was running 20% nitro, there is no shim under the head button. Should there be a shim under there?
This engine is a NS12S3 if that helps.