Derbi Dirtboy 10, Workshop Manual

Page: 31 / 48

31
I
NSPECTING THE VALVE SEALINGS
Measure the width of the sealing surface on the valve seats.
C
HARACTERISTIC
Sealing surface width
Intake:
1,5 mm
Exhaust: 1,6 mm
I
NSPECTING THE VALVE HOUSINGS
- Remove any carbon formation from the valve guides.
- Measure the inside diameter of each valve guide.
- Take the measurement at three different heights in the ro-
cker arm push direction.
E
XHAUST GUIDE
I
NTAKE GUIDE
- If the width of the impression on the valve seat or the dia-
meter of the valve guide exceed the prescribed limits, repla-
ce the cylinder head.
- Measure the width of the impression on valve seat «V», the
wear limit being 1.6 mm.
ENGINE EE
- CYLINDER ASSY. AND TIMING SYSTEM
ENGINE
- CYLINDER ASSY. AND TIMING SYSTEM
I
NSPECTING THE VALVE SEALINGS
I
NSPECTING THE VALVE HOUSINGS
SPECIFICATION
Standard diameter:
Wear limit:
5 + 0 + 0,012 mm
DESC. / QUANTITY
5,022 mm
SPECIFICATION
Standard diameter:
Wear limit:
5 + 0 + 0,012 mm
DESC. / QUANTITY
5,022 mm