i had an aluminum throttle block on my 9R, the stock throttle block was pretty bad. Last year there was a day i had ridden the day before, so my sled was still covered in ice and snow, i let my sled warm up in my trailer and pulled it out when temp was over 100 like i always do and then shut it off while everyone got ready, that ended up taking probably 20-30 minutes, and it was a 0 degree F day. I got on my sled to just turn it around and let it warm back up, so didnt put the tether on, well in that amount of time something thawed then froze, is the only thing i can think of, because when i blipped the throttle it stuck, the sled hit my trailer, threw me off, and went about 100 yards into some brush, ended up WOT upside down. this was an aluminum block WITH TSS. i dont know exactly what happened, but it broke the bulkhead and insurance totaled the sled.