2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 130Get this manual
Cylinder head Valve-stem-to-valve-guide clearancevalve guide inside diameter valve stem diameter: Intake: 0.0100.037 mm (0.00040.0015 in) Exhaust: 0.0250.052 mm (0.00100.0020 in) Valve guide remover 3: YB-06801
Valve guide height a: Intake and exhaust: 10.8 0.2 mm (0.4 0.01 in) 4Insert the special service tool into the valve guide 2, and then ream the valve guideReplacing the valve guide
1Remove the valve seal
2Remove the valve guide by striking the special service tool from the combustion chamber sideE
S6AG5190
S6AG5181