I thawed it out when i got home from fishing , and now it works fine again. However if it freezes up every time its very cold ,somethings wrong. I read somewhere its a good idea to stand your auger up when finished drilling holes, I may try this. But I still think its somewhat of a week throttle setup. Do the new Ultra's have a different throttle, I just got mine 2 weeks ago at cabalas, I would have thought it would be the newest model. It has a red flipper style thumb trigger on the right grip and a wire is attached to it going to the carb.