I ran my sled for 1km or so with an iced up carb. Didn't realize what the problem was until I pulled the plug and saw the plug very light, not white, but very light grey. rean no more than 1 km before solving the problem. I let it idle to keep the temps up under the hood and pinched the fuel line an bunch of times to help dislodge the ice in there. What possibility of damage could occur in that period of time, it was on trail, not wide open but I was squeezing the throttle a fair amount to get power.