X2. Check the thermostat, I had a burn down at the end of last season which the thermostat had to be the culprit because it had collapsed and stuck 1/4 open, carbs and pre filters SPOTLESS and I use 94 octane since I have the option. I did however notice that it seemed to be running oddly hot a few rides before it happened. Im glad I purchased a thermostat before I even checked it, also replaced the temp sensor, on a hunch since these sleds are kinda old. So again check the thermostat or just replace it.