I've been out of the motorized bike thing for a couple of years so I'm not up to speed on who is making the best engine right now. What I am looking for is (1) reliability (2) reliability and (3) reliability. I would like a 66cc or bigger. Not really looking for a LOT of speed, but I would like it to at least be able to hit 40mph for short bursts. I don't want to do any work to it, I just want a good running stock engine and maybe bolt a MZ expansion chamber on it ( I like noise, and I live in the country so I can make all of it I want. ) Any tips on where I can get a REAL MZ PIPE? The only other thing I will add is, I WON"T BUY FROM ROBERT! Thanks in advance.