Is riding in zero degree weather hard on four wheelers? Is the cold air causing my machine to run lean, or is it not enough to make a difference? What is this I hear about having to drill out a plug on the carb to adjust the air screw, what reason could there possibly be for capping this off? Is there any other way of getting at the adjustment, I heard of someone who drilled to far and into the jet? This sounds pretty crude to me. Thanks.

 

Four strokes are far less suseptable to temp changes than a two stroke. Check your spark-plug, and go from there.