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7. Cylinder Head / Valve
Valve Seat Inspection and Refacing
7-11
Clean up all carbon deposits onto intake and
exhaust valves.
Apply with emery slightly onto valve contact
face. Grind valve seat with a rubber hose or
other manual grinding tool.
Remove the valves and check if the contact
face is even or not.
Caution
z The valve can not be ground. If the valve
is burned, worn, or its contact face is
uneven, replace it.
z If the valve contacts the valve seat
unevenly after grinding, replace it.
Valve seat
width
Check the contact condition of the valve seat.
If the valve seat is too wide, too narrow, or
worn, refinish it.
Service limit：Valve seat width: 1.6 mm
Valve contact face width: 1.8 mm
Service limit：1.5mm Service limit：1.8mm
Valve seat grinding
60∘
Please use the valve seat cutter and follow
the instruction to grind the valve seat.
32∘
45∘
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