Arctic Cat is investigating about all the sleds blowing up they say it could be something to do with the timing so then they would need to make something new to do with the efi systems i have been hearing about dealars are working with them to for it. But all i know is ac is working around the clock trying to figure it out but thats one of the problems could be they say. Cause over 50 miles it aint no coolent or oil thing. Its when people are in mid range when its been happening or mostly when letting off gas they say. Timing advancment is off is there guess so far.