This is most common problme with these bikes its actulay to my knowledge not known why but something in gear box does it have it checked out but 9/10 u wont find nething wrong just something these models do u know one of them sounds when they get 30000miles or more they start to make noises best advice i can give is have it checked out by honda if they find nothing then its just that if they find something post a reply and tell me what they found have a lot of friends with that same problme I´m no mechanic just love moto´s and dads a mechanic best friend is and well i know alot PLUS this is one of my fav models