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flat spot at mid throttle after running suspect gasoline

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no sooner had i got my fcr tuned to perfection i changed petrol brands and now it has a huge flat spot at mid throttle and considerably less power up top. i usually run my bike on E10 no problems at all but i tried putting straight 95 in it. is there anything you guys can suggest before i have to pull the carb down. in my opinion it could only be bad gasoline as right before i put the fuel in it,it was running awesome. i have gone through 2 tanks of fuel trying to clear it out but the flat spot is still there. my guess is a clogged pilot jet,maybe from water in the fuel

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