Ski-doo 380 ran, and died.?

[l_julian@sbcglobal.net]

Alright so i have two snowmobiles, a polaris indy 500, and a green ski-doo 380, and this winter i decided to get them out after sitting for about 2 years (indy sat with no gas or oil or gear oil in it) but the ski-doo sat with some gas and stuff in it, so i added some octane booster and some premium gas to it, and put good gear oil in it, the snowmobile ran great, the day i got the new gas and gear oil and all that i let it run for 3-4 hours in the driveway, along with the indy, and the next day i let it run for about 2 hours too.. so i trusted it to go up north with me.. i took both machines up north and ran the hell out of them for about 4 hours and then in the middle of the woods the green one died out of nowhere, then started up, and ran for about 10 more minutes and died again, but this time it was dead for good. I checked the compression, spark plugs, made sure it had spark, pulled both carbs cleaned them both out, and it STILL wont start. The most ive got out of it since i did all that was about a 3 second idle.. i have no idea whats wrong, im almost 100% sure it ran the all the old gas that and stuff that was in it out.. and now it just decides to die, i need some input, i am left clueless.