I have had my 650 for a year now , and all ive done with it is pull my 60" mower around my 5 acres. But now since i have went on a few mud trail rides it now decides to make an eeeeeeerrrrrrrr sound every few times i take off .it doesnt matter if it is in hi-lo-rev.i have read a few things about this and some say its a belt adjustment problem or is it mud, water dirt problem? If someone would help me on this problem id really appritiate it .

 

Your belt is probably to loose and needs to be adjusted. You can find all the info you need to adjust it yourself on on Nyrocs website.