I have a 02 660 other than wheels and tires it's stock and it's fine. more times than not it takes the holeshot. the last race of the season it lightninged and d poured. i got the quad back home fine and a week later i start it up and like i said reved fine but blip the gas and it cuts out. i noticed there was some gas pooling out of the intake and i think(the winter since i played with it) the right side wasn't sucking. I hit it w some cleaner and it is suckng but still blip and dies.