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is it running rich?

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i've got a 89 xr250r and i have just baked off the welds in the exaust head. my problem is that it keeps back fireing when i throttle off. is it running to rich or lean? do i have to adjust the pilot screw?

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You are way too lean. If it is hot and backfiring...it is lean. Try to richen up your main jet. FS should be 1.5-2 turns out.

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