I considered the low oil syndrome, but didn't see the usual gaps that appear between the cam & followers and the cap & boss. easy way to tell is to pull the cam. also the oil filter will be full of aluminum.
http://www.ebay.com/itm/05-Kawasaki-...66dbfa&vxp=mtr
good price but you need the caps.... they are machined with the head when it's made.
the intake cam will be OK, the rt side journal on the ex cam will be hashed
there is a company that repairs them but it's not cheap