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The piston is scoured, the cylinder might clean up with a light hone. The carbon on top of the piston is a non-issue. No oil, screeching rpm killed the engine. What caused the high rpm was probably a loose manifold, open vacuum line or air getting in someplace. No oil finished the job.
Pistons, rings and a new barrel are cheap. Fix the oil leak and find out what caused the rpm to go berserk.
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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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