I was playing with my 110 yesterday and the engine started up and flew great... No stalling, bogging or overheating issues... Had plenty of power as well...can't really complain about the engine as mine works fine... air temps were around 70 degrees here in the northeast so not too warm and definately not too cold out.. I have a couple of head shims in mine and I'm running 20% coolpower fuel.. seems to work fine that way... I looked at converting the engine to a more common 12 out of one of my R/C cars, but this one works fine.. If I change it at all it will be to a brushless setup.. just for ease of use...