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Two things right off the bat. Have you checked the valve clearances? A 50cc GY6 only starts out with .002 inches of clearance out of the box. It doesn't take long for those to close up. Second, look for a cracked or broken vacuum line or intake maifold. It will start fine and run good on the centerstand with a wound like that but will run like crap on the road. Been there myself. These engines are bone simple, reliable and usually are hindered by something simple.
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2008 Eagle Milano 150- 9,679 miles
2009 Honda Rebel 250- 10,434 miles
2009 CF Moto Fashion- 16,023 miles
2009 MC-114 50cc Cub Clone- 4,317 miles
twowheeler.yolasite.com/
That's 30,049 China Scootin miles and Counting.
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