After riding my 06 rmz 450 Sunday night, I noticed a clunk sound in the rear end. I placed the bike on the stand and lifted up on the rear wheel, it moved about .5 inches. Upon further inspection, the cam in the lower linkage where the shock bolts on has a 1/8 inch crack all the way across the cam. The bike only has 40 hrs on it and has been a real blast to ride and given me no trouble before this. Has anyone else seen this problem?