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WR250f erratic running

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Hi, I have a 07 wr250f, completely stock. I haven't owned the big long but it has never ran right since I've had it. Bike runs very erratically, one minute it's perfect, then it Bogs at low RPM, then it's fine again. Today I set up the mixture screw as per the manual 1,3/4 turns out, the bike ran perfectly and then after a few minutes of riding the bike stalled and when I got it started again it was so rich it was spitting flames!! Please help !!

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Turn off the fuel petcock, drain the carburetor bowl with the drain screw, turn the petcock back on, and try it out..

Edited by YZEtc
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