I have a 2001 snow pro 440 fan cooled .I put a new coil on and cleaned the carbs and the sled runs good for a good 30 to 40 min then bogs out and loads the plugs up ,and will not go over 4000 rpm . I then let the sled sit for a hour then it runs good for the same amount of time .The sled has no problem ideling or even when you put it on a jack stand .does any one have any input???
