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Discussion Starter · #1 ·
Hey guys I have a 2004 raptor 660 and it has a aftermarket yoshimura exhaust rs-3 and header and every time I go full throttle it backfires I’m assuming it’s the jets cuz the carb it’s at stock settings and it has a knn filter what jets would y’all recommend I’m in 1190 elevation in Arizona
 
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