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09 WR 250f Backfire

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I'm having a back fire when I close the throttle in 3rd gear ???

JD kit

3rd clip

175 main

42 pilot

Any help ?

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Have you gone through the procedure to set the fuel screw? If so, how many turns out. Any more than 3, you need to go up on the pilot jet.

Keep in mind some back fire is normal....

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Gouge I just got from a friend re. backfiring:

Pull the choke and repeat the situation that originally caused the backfire. If it still backfires its a rich condition (no change with richer mixture) if it clears its a lean backfire (the richer mixture took care of it).

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What muffler are you running. What temp/alt do you ride in.

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