I know! and with cats, 2 will trun into 30 quick! I don't know what to do about an engine?? I bought an converted homelite 25-30cc 0n E-Bay and it will not fit, the fly wheel is to big. I have a O.S. 61 that i had on a 25% lazer that I'm thanking of installing on it. It flu the lazer good. The next biggest engine I have in glow, Is a Super Tiger 4500. That use's 40oz of fuel in 8min. and is 5lbs. I'd like to stay with gas. I will figure it out??? ':~/