Ok, did a little more reading and now I'm even more confused. The engine case numbers.....most common type of gy6 is 157qmj. There is little info on case numbers with 157fm. From what I've read the case sizes are different. Also seems that the fm models used a 125 case. Still a 57mm bore. Just a smaller case. So my question is, will qm parts work on a fm engine? I figure they should as long as I don't bore it. I have read about the big bore kits. Seems a lot of people have had trouble after installing a big bore kit.
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