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Check the intake manifold for a crack. Check all the vacuum lines for cracks. Start the scooter and see if you hear a hissing noise. If you do, find it.
Also, and this is out there, take off the exhaust pipe and see if it has a dent or something blocking it. Years ago I had a Bashan with a bad weld at the manifold that blocked off a third of the pipe. It wouldn't do 50 miles an hour before I replaced it. After that it would run all day at 55 mph.
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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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