2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 96Get this manual

2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 96

Cylinder head
a Slag or rough surface

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 marks3Use 30 cutter to adjust the contact width of the top edge of the valve seat
Valve seat contact width a: 1.201.60 mm (0.04720.0630 in)

Refacing the valve seat
1Reface the valve seat with the valve seat cutters30 45 30 45

Back to 2005 Yamaha F90TR 90HP Outboards Factory Service Manual