Ok here's the deal, a friend of mine did a complete top end job on another friend of mines 99' YZF400F (new cylinder, piston, rings, valves, springs and cam chain). The bike has no compression since he finished. You can push the kick starter down with your hand! Once we pulled the head and aligned all of the timing marks we see that he a put the cams in 180 degrees off. My question is is there an easy way to spin the cams with out taking everything apart? If so please let me know how, your help would be greatly appreciated!