Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 272Get this manual
CAMSHAFT AND VALVES 4Measure: Valve stem outside diameter Out of specification ReplaceValve stem outside diameter d:
5.4755.490 mm (0.21560.2161 in) Exhaust valve: 5.4605.475 mm (0.21500.2156 in) Intake valve:
5Measure: Valve stem runout Out of specification
Replace
Valve stem runout limit (intake valve and exhaust valve): 0.03 mm (0.0012 in)