2000-2005 Yamaha F40B Outboard Service Manual, Page 230Get this manual

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CYLINDER HEAD
3Measure: Valve seat width Out of specification valve seatValve seat width 0.9 -1.1mm (0.0350.043 in) Reface the

CHECKING THE VALVE
1Check: Valve Deformation

Replace
2Measure:

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives