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87 yz 490 Jetting Question

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Ive got am 87 490 the stock pipe is trash (metal fatigue) after every ride its weld it up or JB weld. Problem is: don't want to have to rejet carb If I go with a FMf or Pro circuit pipe. It runs good now no pinging problems or lean. And I sure don;t need any more power any where , but after market is certainly cheaper fix tham stock exhaust. Any ideas?

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