I have a 2006 banshee that is stock other than CPI pipes and 28mm Keihins bored to 30mm. This is how I bought the quad. I have had it about 9 months. It has always ran good without any problems until this weekend. I ran the quad for about 30 minutes on Friday. I ran it relatively hard, and it ran fine as always on Friday afternoon. The gas in it had been in the tank for a couple months, and it had Stabil in it also. I topped off the fuel tank on Saturday morning with what I thought was the same batch of premix. It was supposed to be 93 octane pump gas with Klotz Techniplate at 32:1. Again, it ran fine the day before on this same gas. Saturday the bike didn't seem to smoke at all after it got warm, but it smoked some on Friday even after being warm. After running it about 5 minutes on Saturday it began to idle really high and act kind of unusual, so I immediately shut it down. I'm beginning to think the fuel I added on Saturday must not have been premix. I drained the tank and refilled it with fresh premix I ran the quad again, and this time it did smoke a little(the same amount I thought it smoked Friday). But, it continues to idle high, something it never did before Saturday. It runs fine otherwise, and has its normal power. But it continues to idle really high. Any ideas? If I ran it without premix, I know it would have damaged the rings and bearings, but why would it still be idling high? Thanks for any info or help.