I hit 35 today!!!! I have a stock exhaust that I opened and drilled out, and a less restrictive air filter, also a Honda spree head. My compression is about 115-120psi.. So happy. It takes a long time to hit 35 but now the thing is solid 28-33. I have a sha 15:15 carb coming soon. hoping to make it a solid 30-35. Thanks for all the info y’all!