So i had a quick ride on our sled today and i rode it about 500 feet and then went to go park it and as soon as i slowed down it just bogged down and died. Tryed to start it and it back fired. This is the first ride of the season by the way. Could this be bad plugs? Battery not charged? Old gas? I want to get a idea of what it could be and where to start before i tear into it. And help would be great! Also how do you charge these batterys?