ENGINE AND PERIPHERALS
S
pecifications10
87428R91881R
VALVE GUIDES
Inside diameter ( mm)
Normal7
Outside diameter in the cylinder head (mm)
Normal12
The inlet and exhaust guides are fitted with valve
stem seals. They must be replaced whenever the
valves are removed.
Inclination of the guides:
- Inletβ
= 17°
- Exhaus
tβ
= 17°Position of the guide in relation to the bottom of
the valve spring (without lower cup) (mm) :
- Inlet:
A = 12.34
- Exhaust:E = 12.34
91881-1R
VALVE SEAT
Seat angle
∝- Inlet 120°- Exhaust90°
Width of the seats (mm) X
- Inlet1.7 ± 0,1- Exhaust1.7 ± 0,1
Outside diameter (mm) D
- Inlet38.5
- Exhaust34.5
10-12
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88988-1R
ENGINE AND PERIPHERALS
En
gine repair10
REGRINDING OF THE VALVE SEATS
Inlet
- seat width (mm) :
X = 1.7 ±
0.1
- angle :
α = 120°
The seat (1) is re-cut using
cutter 208, angle 31°.
Reduce the width of this seat at (2) with cutter
n
°
212 angle
75° until width (X) is obtained.
NOTE: Observe the position of the valve on its seat.Exhaust
- seat width (mm) :
X = 1.7 ±
0.1
- angle :
α = 90°
The seat (1) is re-cut using
cutter 204, angle 46°.
Reduce the width of this seat at (2) with cutter
n
°
273angle
60°until width (X) is obtained.
91880R2
10-31
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