I had a 1999 Polaris that had a over heating problem and I heard alot of people say that about the radiator, my buddy has a 2007 Sportsman 500 and last time it had a over heating problem and all it was, was the radiator clogged up. On mine I just put a cooler thermostat in it and problem was solved. From what my buddy tells me with the two seater that Polaris makes, it isnt set up the same as the regular Sportsman, its not just a sportsman with a stretch kit, but totally different because he went to get electric power steering for it and found out the entire front end, oil tank and everything is different and had to send it back. as far as that guy with buy a Yamaha, give me a break.