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ok hears the deal one yamaha is only leting your 50 cc machine carb open have way so one go to raptor80racing.com and get a jet kit 2 cut the slide valve so it will open all the way two get one of 2 cdi boxes availble form r80r.com 3 get a header and pipe and kandn high flow airfilter 4 race shocks 5 off set wheels and tires then watch this little snail keep up with a 660 in second gear high oh yeah widing kit to really helps and the tires are bigger and run on less air pressure so its works out great the real deal is the carb its only opening half way talk to the guys at raptor80racing.com
so there you have it all the info yo need to make a 50 or 80 run like crazy p.s. if you want to see it run like a bat aout of hell take 8 out of the 12 roller balls in the tranny lighting it and make the top end higher to get it to grab lots of power to be hade just have to know how to get to it oh yeah i think you can geta 4 speed tranny from the 80 to fit a 50 not sure yet looking in to it good luck and by the way 50 cc in a yamaha is a 50 cc in any other machine
cool later happy riding