Thanks for the info...your evolution sounds much better that mine....This one was purchased to teach beginners and we are having problems with the engine making metal to metal sounds and leaking afterrun oils out the front...Horizon does not feel that they have any responsibility since they did not sell me the engine...It is a new engine so we will run it till it drops and get a decent engine not sold by Horizon Hobbies...As you know only Horizon sells this engine...