Suzuki GN125F, Service Manual

Page: 43 / 148

E N G I N E
3-12
Valve seat angle
Valve width
INTAKE
EXHAUST
30 , 45
O O
15 , 45
O O
0.9-1.1mm
Check the contact surface institute.
If found any defective, service the valve seat.
45
o
15
o
Exhaust side
N-122
N-121
45
o
30
o
60
o
Intake side
N-122
N-126
N-111
09916-21110: Valve reamer set
Damaged surface Uneven contact surface
EXHAUST
valve seat
45
o
Contact surface is too low
Contact surface is too high
30
o
60
o
Using the 45 reamer, descale and cleanup the seat with
one or two turns.
o
The valve seat position will affect the contact surface
of valve, this is very important to the good sealing.
NOTE
:
Check the contact position.
°
If the contact face of the valve
is too high, finish it with 30 reamer to reduce the height.
If the contact face of valve is too low finish it with 60
reamer to increase the height.
Finish the valve seat surface again to standard range with
.
°
45 reamer
o