2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 145Get this manual
CAMSHAFT, ROCKER ARMS AND VALVES
3.Check: Valve face Pittingwear Grind the faceG Valve stem end Mushroom shape or diameter larger than the body of the stem Replace
CAMSHAFT, ROCKER ARMS AND VALVES
3.Check: Valve face Pittingwear Grind the faceG Valve stem end Mushroom shape or diameter larger than the body of the stem Replace