i got a 07 foreman 500 a few days ago the guy said h thought it needed a new crank case but there is no hole and the bike makes a clunking sound when in gear but starts fine and still pulls if any one has any idea of what it could be please let me know

 

This "clunk' you speak of while in gear...is it a constant sound that speeds up and slows down with engine speed? Does it do it in every gear?