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Jd jetting kit and exhaust?

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gday guys,ive got a 01 wr426 and the previous owner put a 09 wr450f pipe on it but also gave me yz426 pipe,i just put the yz muffler on and it was shooting flames out about 10inches long and a cool looking blue,and it never did it with the wr450f muffler so is it doing this because its tuned with the Jd kit or could it be the yz426 muffler packing is knackered?



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