got a question for everyone. my buddy just bought an 07 1200 custom. the bike has been sittin idle for the past 6-8 months. he put new high test gas in the tank but did not drain the old fuel out. when he opens the throttle up the bike coughs a little bit... nothing too bad but annoying. just wondering if the leftover old fuel would cause this...could the carb gum up that quick? i would appreciate any help any of you could give us...thank