I have a YZ144 done by Eric Gorr and ported for low/mid powerband and pump gas. I was a little surprised to see that the compression is about 215 psi. This seems high to me. I was wondering, how do you know if a 2 stroke engine is running too high a compression ratio? I can't hear any pinging, and I took the head off after about 1 hour of riding and I don't see any pitting suggesting detonation. It seems to me this engine is very happy as is, so my question is why am I able to run such a high compression on regular gas? Is it due to the porting perhaps? Just curious.