2008 Yamaha WaveRunner FX SHO / FX Cruiser SHO Service Manual, Page 200Get this manual
Cylinder head
Valve seat refacing
CAUTION:
Do not over cut the valve seatBe sure to turn the cutter evenly downward at pressure of 4050 (45 kgf, 8.811 lbf) to prevent chatter marksNOTE: Does not turn the special service tool counterclockwise when refacing the valve seat1Reface: Valve seats Neway valve seat kit: YB-91044 Valve seat cutter holder: 90890-06812 Valve seat cutter: 30 (intake): 90890-06720 45 (intake): 90890-06325 60 (intake): 90890-06324 30 (exhaust): 90890-06818 45 (exhaust): 90890-06555 60 (exhaust): 90890-06323