That isn't a petcock, it's a fuel pump. You will probably get results from changing the fuel and vacuum lines. Did he let it sit for a long time? You could have crud in the carb that will require cleaning or treatment with Seafoam.
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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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