So yesterday on the way up the mountain my thermostat decided it wanted to retire... no big deal, I always watch temps closely so no harm done... went from a steady 145 on a HARD packed trail to 200 in about 1/4 mile. I was watching it the whole time and shut it down right away... cooled back down to 150 and went another 200 yards before getting hot again, shut it down and pulled the thermostat out. I've been searching online and it appears the part number has been superceeded from 1206407 to 1206124, did they have a bad run with these or something? I've only ever had 2 thermostats fail on sleds in the last 15 years and this one only had 850 miles on it. I ran the rest of the day without it and honestly I couldn't tell that it wasn't in there other than it taking a little longer to warm back up after breaks. Dealer isn't open until Tuesday to inquire with them.