2002-2006 Yamaha YFR450FAR Service Manual LIT-11616-16-01, Page 151Get this manual
CAMSHAFT, ROCKER ARMS AND VALVES
CHECKING THE VALVE AND VALVE SPRING 1.Measure: Stem-to-guide clearance Stem-to-guide clearancevalve guide inside diameter valve stem diameter Out of specification Replace the valve guideClearance (stem to guide): Intake: 0.0100.037 mm (0.00040.0015 in) Limit: 0.080 mm (0.0031 in) Exhaust: 0.0300.057 mm (0.00120.0022 in) Limit: 0.100 mm (0.0039 in) 2.Replace: Valve guide Replacement steps: NOTE: To ease guide removal, installation and to maintain correct fit, heat the cylinder head to 100 (212 F) in an ovenG Remove