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well at any rate I did do this and it is about 1/8. Just wish I could get that last 5 mph out of it..lol thanks...

gy6 qmb139 50cc 4stroke....actually I assembled this bike from many scooters. I dnt know how many miles? And no tach. Brand new spark plug. I do have another belt to compare to and unless there both stretched. Just starting to ride for the first time. And was thinking it would go 30 or so. everything is stock except the coil and the cdi. the cdi is blue and says q power p50 but its hard to read the lettering is a bit worn. coil is a little square box about 2''x2''x1'' black and has a blue plug connector. im starting to lean towards the clutch? Should i be able to depress the spring by hand? Its really tuff..lol and its looks stock.

Damn no luck. Im thinking my r/r is toast.

actually everything is unhooked. Except the coil it seems.Theres no way to just rig one until I can properly run one. I did install a automotive magnetic tail/brake light. Just trying to get by so I dnt get hassled for a brake light?

Lol. yea Im a rookie... So AS to address this I actually found that the carb I had decided to install on this project was bigger than another one I had. The outside or exterior of the carb was somewhat identical. Most parts being swappable between the two. Except for the diaphragm, spring, and air fuel ratio screw. After messing with the big one with the vacuum diaphragm open and the scoot started i was pulling it up and down and twisting the throttle. and got a desired acceleration and starting. (I forgot to mention it was bogging at wot.) So installing the smaller carb adjusting it adjusting the valves new plug premium gas switched back to the regular cdi and new ground wires. She rides quite decently for a 50cc. So thanks this was much help.

Ok, So I have adjusted the valves. The intake valve was really tight like a whole turn or more. So I have set it using a Arizona tin can. The exhaust seemed to be ok using my tin gauge. With this step being done I tried starting it with no luck. So I have popped out the spark plug and its black with wet gunk. Keep in mind i was running it with the valve open? and had adjusted the fuel/air screw way out...now realizing it was filthy rich...It was brand new less than 20mi ago.

Thanks, Well Im a bit tap out for american earth monies on this project. I actually bought this scoot for 40$ in about a 150 pieces..lol I did do a bit of googleing on pop can thickness and they do range in thickness. Im going to choose a bargs root beer can apx .0038 and see if my luck with the hard starting will vanquish. Thanks and ill deff post my happenings.