i have had so much bad luck with my redcat racing engine, i never got it to run right, followed all breakin instructions and everything, had my father in law look at it and couldn't get it running and hes been working with nitro engines for years. I called redcat racing and asked what i could do and they said do the engine replacement thats all they could do, and I have only had the thing for a week, didn't even put 3 tanks of fuel through it.