OMG! Has anybody adjusted the valves. What you're describing is a classic case of tight valve clearance. The exhaust valve gets hung open and you lose compression when the engine gets warm. Ultimately it holds the valve open so much it won't run anymore. Have your mechanic check that. Instructions for adjusting the valves on a Linhai 257cc are on Youtube.
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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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