Honda SH125 Manual page 174

CYLINDER HEADNALVES
Reface the seat
Use a 45" seat cutter to remove any roughness or
with a 45"cutter
irregularities from the seat.
whenever a valve
g u d e
I S
replaced.
TOOLS:
SH125:
Seat cutter, 27.5 mm (45" IN) 07780-0010200
Seat cutter, 24 mm (45" EX) 07780-0010600
Cutter holder, 5.0 mm 07781-0010400
SH150:
Seat cutter, 33 mm (45"
IN)
Seat cutter, 24 mm (45"
EX)
07780-0010800
07780-0010600
Cutter holder, 5.5 mm 07781-0010101
ROUGHNESS
I I
~~ ~
Using a 32" flat cutter, remove 1/4 of the existing
valve seat material.
TOOLS:
SH125:
Flat cutter, 30 mm (32" IN)
Flat cutter, 25 mm (32" EX)
07780-0012200
07780-0012000
Cutter holder, 5.0 mm 07781-0010400
SH150:
Flat cutter, 33 mm (32"
IN)
Flat cutter, 27 mm (32" EX)
07780-0012900
07780-0013300
Cutter holder, 5.0 mm 07781-0010400
OLD SEAT WIDTH
I
Using a 60" interior cutter, remove 1/4 of the exist-
ing valve seat material.
TOOLS:
SH125:
Interior cutter, 26 mm (SO" IN)
Interior cutter, 22 mm (60" EX)
07780-0014500
07780-0014202
Cutter holder, 5.0 mm 07781-0010400
SH150:
Interior cutter, 30 mm (60" IN)
Interior cutter, 26 mm (60" EX)
07780-0014000
07780-0014500
Cutter holder, 5.0 mm 07781-0010400
Using a 45" seat cutter, cut the seat to the proper
width.
VALVE SEAT WIDTH: 0.90
-
1.10 mm (0.035
-
0.043 in)
8-18