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modded zr 500 not running right
i have a 2001 zr 500 with k&n air filters bigger jets and a Sno Stuff silencer at the beginning of winter ran fine beat 700 XC and 600 zrt at drags until i had a front end collision with what i thought was a drift, unfortunately it wasnt and it hasnt run right since, sometimes backfires or kind of sputters or die's you could say sort of like carbs not being synchronized or timing is out. 1 plug is nice brown colour other looks rich. changed fuel pump and still same thing. Anyone with an idea let me know thanks.
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