another good mod for any 2 stroke engine is stuff the case. These glow engines already have tight tolerances, but i bet if someone was crafty enough, they could make it tighter. If you start tampering with engines, be prepared to loose one or two. I played with a homelite 25cc for a while, but it did blow up from pushing the limits. no matter what you do, have fun and i hope you learn something in the process.