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01 426 jetting

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i have a 2001 yz426 stock with a gytr slip on. Carb has all stock jetting w/ clip in 4th slot. Poor responce when throtal opened quickly. almost misses. I ride at sea level to 500ft. please help

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ryan15,

Make sure the carburetor is clean and working well, accelerator pump working and clean air filter.

Try adjusting the fuel screw on the bottom of the carburetor. Turn it in 1/4 turn increments in each direction to see if it helps. Keep track of where it runs best. Adjust the carburetor needle clip position next if needed.

James

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