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my 03 wr 250f was backfiring really bad today, i have put on a new white brothers e2 exhaust pipe and have rode it like 4 times before today without any problems it said to use the stock jetting. I drained the oil and the gas and am puttin in a new oil filter, new oil, and new gas, am i doing the right thing?

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Was the backfiring on deceleration. If it was, then richen up the fuel screw. The one on the bottom of the carb. Turn it out, but not more than 3 turns out.

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Was the backfiring on deceleration. If it was, then richen up the fuel screw. The one on the bottom of the carb. Turn it out, but not more than 3 turns out.

I had that problem. When I let off it would pop. Turning the fuel screw out fixed the problem.

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