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Bike Backfires

422 Views 0 Replies 1 Participant Last post by  drnkdwarf3
I have a 07 yfz450. just put on a DASA full exhaust, uni filter with lid on, 172m and 45p. bike runs good but pops and backfires when you let off the gas. im in Arizona about 1300ft, right now its between 60 and 80 degrees. Anyone have any thoughts on what is going on? Thanks
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