Sorry to hear your kit crapped out. Seems some of them last forever, and others fall apart just as they're broken in. I have a SkyHawk 66cc kit, and have put about 900 miles on it since I got it October 20th. I ride the snot out of it, and its performance hasn't yet diminished in any way. I haven't had any trouble with anything other than the tensioner pulley wearing out. But, this raises a question for for anyone who has owned or currently owns both 48cc and 66cc kits: I'm expecting a good tax return this year, and am looking to buy an engine kit or two. I'd like to ask if either of them is a better performer, etc. I'm about 210 lbs, and I carry a rack trunk and panniers full of goodies. I can't decide what to do.