Recently picked up a brand new jonsered 670 champ off ebay for 299.00 + shipping. I think I lucked out as that was they buy it now price and it had been listed for less than an hour. Starting bid was $1.00 but I knew someone would buy it now if I didnt. It was a little dusty but had never cut wood. Got a 20" pro top from jeff sikkema and was good to go. Anyway my question is about the air inlet flaps in the top cover that feed warm air to the carb. This saw has two instead of one. Why is there two? The saw was shipped from canada. Is it something exclusive to canadian models?