2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 147Get this manual
Quality of the image is intentionally reduced!
CAMSHAFTS 1 2
NOTE: To prevent the timing chain from falling into the crankcase, fasten it with wire 3CHECKING THE CAMSHAFTS 1 Check: camshaft lobes Pittingscratchesblue discoloration Replace th