My snowmobile and PWC, which tend to sit for long periods of time in the off-season, run like crap at the beginning of the year. The gas with Sta-bil, ethanol and the other stuff just does not want to run well. I found that the ethanol + stabilizer combo just does not burn well at all. The ethanol has been murder on engines from what I have seen, especially the older gas.
If it were me, I would find a way to safely siphon out as much of that old gas as I could. Put in a nice batch of fresh gas...just gas, no additives (unless you need to mix in oil). Fire it up and rev it up a bit. After it runs for a little while, change your spark plugs as they may have fouled.
As for disposal of the old gas, I can't help you there. I have heard of people using that old gas in lawn mowers, and even in their cars. Not sure I would recommend that...
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