my uncle bought a 2004 yfz and it was constently overheating and he would have to shut it off and wait for it to cool down. we do alot of trail riding with 80cc quads but i like to go fast and i was looking at getting one. my uncle sold his because of this and now he has a 700kfx and he said dont do it because of the overheating does any one no what it could have been or have any sugestions