No small 2 stroke engine likes to run if the engine temperature is below 80C - 100C. If you have a very cold engine and the pistons heats up faster than the case you have created the opportunity for a "cold stick" to occur. Hence the bent rod advice in an earlier post. Many of you running over snow will be starting and running an engine very near Zero C.

Better to take a heat gun and warm up the case and head before attempting a start. Once started you need to get the engine to above 120C for any appreciable "break in" to take place. Below that temp all you're doing is glazing the cylinder and preventing break in.