Honda 2003 NPS50 Ruckus Service Manual page 141

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I nspect the valve seat face for:
Damaged face:
- Replace the valve and reface the valve seat
Uneven seat width:
- Bent or collapsed valve stem; Replace the
valve and reface the valve seat
•
Contact area (too low or too high area):
- Reface the valve seat
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REF ACING
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NOTE:
Follow the refacing manufacturer's operating
i nstructions.
Be careful not to grind the seat more than neces­
sary.
If the contact area is too high on the valve, the seat � c = o =
must be lowered using a 32° flat cutter.
If the contact area is too low on the valve, the seat
must be raised using a 60° interior cutter.
Refinish the seat to specifications, using a 45° finish
cutter.
CYLINDER HEAD/VALVES
DAMAGED FACE U N EVEN SEAT WIDTH
TOO LOW
CONTACT TOO LOW
-�[o o o
�
TOO HIGH
OLD SEAT WIDTH
9-1 5