Yamaha WaveRunner FX Cruiser SHO, Service Manual

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2. Use a 30 ° cutter to adjust the contact width
of the top edge of the valve seat.
b
Previous contact width
30 ˚
b
3. Use a 60 ° cutter to adjust the contact width
of the bottom edge of the valve seat.
b
Previous contact width
60 ˚
b
4. Use a 45 ° cutter to adjust the contact width
of the valve seat to specification.
b
Previous contact width
c
Specified contact width
5. Check the valve seat contact area of the
valve.
Refer to
“ Valve seat check. ”
45 ˚
b
c
Example:
• If the valve seat contact width is too wide and
situated in the center of the valve face, use a
30
° cutter to cut the top edge of the valve
seat, and then use a 60 ° cutter to cut the bot-
tom edge to center the area and set its width.
b
Previous contact width
30 ˚
60 ˚
b
• If the valve seat contact width is too narrow
and situated near the top edge of the valve
face, use a 30
° cutter to cut the top edge of
the valve seat, and then use a 45 ° cutter to
center the area and set its width.
b
Previous contact width
30 ˚
b
Cylinder head