2008 Yamaha WaveRunner FX SHO / FX Cruiser SHO Service Manual, Page 200Get this manual
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Cylinder head
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 spec