ok here's the deal, guy came over with a mx 470 89, rings and piston on clutch side where scrap so i put a new set of pistons and rings. reasembled the engine and now it wont stop overheating. if you start it and leave it idle for 5 min it would reach 80. when ridding in snow it could take up to 15-20 min before you get to 80. Drained out the cooling system, still overheating but i noticed its more on the clutch side that gets hot ! now i dont no what else it could be ? any sugestions...