2002 660 grizzly will not go over 51kmh in 2wd or 4wd how do you fix this?

check were your throtel is and there will be a screw it is probabley set for that speed to change bck the not off then undo the screw to go faster check were your throtel is and there will be a screw it is probabley set for that speed to change bck the not off then undo the screw to go faster