The Nitro was built in the SYM factory in China. I would have checked cracked vacuum lines or a cracked intake manifold before replacing parts. A lack of top end usually indicates an air leak, exhaust restriction or carb crud. Sitting for two years didn't help.
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2021 Dong Fang Super 200- 1,161 miles
1991 Honda Nighthawk 250- 17,443 miles
2009 CF Moto Fashion- 18,608 miles
1983 Kawasaki 750 Spectre- 47,113 miles
twowheeler.yolasite.com/
That's 30,049 China Scootin miles and Counting.
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