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bought 04 ultra ran fine when i bought it put wrong octain gas in bike started backfireing changed gas to higher octain gas will that fix my backfireing problem
It may take a couple of tanks to get rid of all the low octain, but back fire and poping is attributed by a leak in the exhaust or running with a high AFR (lean).
One tank of low octane won't hurt anything. I'm curious to see if your backfiring goes away with high octane fuel. Cheap gas can make it run a little poorly but it shouldn't be a drastic change in performance on a stock motor.
Did you touch anything else on the bike before it started backfiring?