So, I got me a good ole 039 off fleabay, piston and cylinder and everything looks good. Put new impulse/fuel lines on it. New skf bearings and seals along with a cross popup piston and caber rings. My issue is I'm only getting 148 psi and the squish is 87 thousandths!!! It has about 3 tanks through it. I measured the new and old bearings and they're are identical in diameter as well as the oem piston and the popup piston, all same measurements. Put just enough sealant on the pan, not too thick. I'm stumped as to why I'm getting that large of a squish. Anybody have any ideas? It runs good but I'm trying to make it run better. Anybody know How much taller a ts400 piston is than the oem?