So I brought the compression ration on an air cooled 80cc two stroke up to 162 psi. 162/ 14.7 gives me 11 to 1. 14.7 being atmospheric. am I calculating this right? Can anyone educate me on pumping loss? Also interested in people’s experiences with race gas C12 or anything oxygenated U4.4 in a two stroke. going to tag @Strong Bad he seams to have a lot experience with two strokes.