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Hey everyone new to the forum I recently purchased a 2006 Yamaha r6 and the guy told me he was running race gas in it he had it for a year only put 1000 miles on it my question is I filled it with non ethanol fuel and a few days later it had a rough idle almost like a normal engine with a upgraded cam has a slope to it and It has a full two brothers exhaust system on it is it running lean causing the rough idle like a lope because it doesnt have a power commander but at the same time it ran great with race fuel. I dont really want to seize the engine it's not running right at all thanks for your time let me know if you have any advise
 
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