1st, check your plug. If it's still black, clean it up or replace it. If it still sputters, 2nd thing to check is fuel mixture screw. It should be set between 1 1/2 -2 1/2 turns out. Adjust it half a turn at a time and check for sputtering. If you end up with it 3 or more turns out, you need a larger pilot jet. 3rd, check to see if pilot jet has some gunk in it; note sizes of jets, you may need next size up or down. 4th, check float height.
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2018 Bashan Storm(sold)
2016 Magician 250
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