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backfires

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i replaced the 3 intake valves of my wr 400-99

and also the timing chain .now i have backfires

when i am living the gas throthle .i have also pro circut pipe include header

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Hi, re-check your timing, and also valve clearances. If your bike ran OK before the repairs, the problem must be there, good luck.

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thanks chris

tomorow i will take the bike to my mechanical

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