Honda LEAD 110 2009 Service Manual page 229

CYLINDER HEAD/VALVES
VALVE SEAT REFACING
• Follow the refacing manufacturer's operating
instructions.
• Be careful not to grind the seat more than neces-
sary.
If the contact area is too high on the valve, the seat
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.
Use a 45° seat cutter, remove any roughness or
Reface the seat
irregularities from the seat.
with a 45-degree
cutter whenever a
TOOLS:
valve guide is
Seat cutter, 27.5 mm (IN, 45°)
replaced.
Seat cutter, 24 mm (EX, 45°)
Cutter holder, 5.0 mm
Use a 32° flat cutter, remove the top 1/4 of the exist-
ing valve seat material.
TOOLS:
Flat cutter, 27 mm (IN, 32°)
Flat cutter, 22 mm (EX, 32°)
Cutter holder, 5.0 mm
9-18
CONTACT TOO HIGH
CONTACT TOO LOW
07780-0010200
07780-0010600
07781-0010400
07780-0013300
07780-0012601
07781-0010400
45°
60°
32°
OLD SEAT WIDTH
32°
OLD SEAT WIDTH
60°
ROUGHNESS
OLD SEAT WIDTH
32°