I have a 2012 sportsman 500 HO when I ride and try to go top speed its like the motor just sputters and wont rev up and loses power. last time thus happend I just put a can of seafoam and it fixed it. this time seafoam aint working. any suggestions? plz help I filled up with premium gas and h ave been revvving it up trying to get the bad gas too pas threw. is this a good idea? what.can I do?