Fairbanks Snow Travelers

We have just heard some horror stories from people starting their sleds the past few days. Due to the weather bouncing between freezing and warm it is causing a problem with throttle/carb icing. Someone starts a machine, lets it warm up for a few minutes, then shuts it off. When they go to restart it, the throttle is stuck wide open. Do not start your machine without having your tether cord attached to you or having your brake on. Scary stuff.