SYM 6. CYLINDER HEAD/VALVE
6-11
Use 60° cutter to cut a quarter lower part out.
Remove the cutter and check new valve
seat.
Use 45° cutter to grind the valve seat to
specified width.
Caution
Grind valve seat again if necessary.
Coat the valve seat surface with red paint.
Install the valve through valve guide until the
valve contacting with valve seat, slightly
press down the valve but do not rotate it so
that a seal track will be created on contact
surface.
Caution
If the contact surface too high, grind the
valve seat with 32° cutter.
Then, grind the valve seat with 45° cutter to
specified width.
If the contact surface too low, grind the valve
seat with 60° cutter.
Then, grind the valve seat with 45° cutter to
specified width.
Make sure that all roughness and
uneven faces had been grinded.
The contact surfaces of valve and valve
seat are very important to the valve
sealing capacity.
Old valve seat width
60°
45°
1.0mm
Contact surface too high
32°
Old valve seat
width
Contact surface
too low
60°
Old valve seat
width
Summary of Contents for ALA125CC
Page 45: ...SYM 13 BRAKE 13 3 MECHANISM DIAGRAM Rear Drum Brake System 0 8 1 2 kgf m 0 8 1 2 kgf m...
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Page 176: ...SERVICE MANUAL...
