Derbi Dirtboy 10 Workshop Manual page 33

E E ENGINE
E NG I N E
C
HARACTERISTIC
Minimum allowable diameter - Intake:
4,970 mm
Minimum allowable diameter - Exhaust:
4,960 mm
Standard clearance - Intake:
0,015 ÷ 0,042 mm
Standard clearance - Exhaust:
0,025 ÷ 0,052 mm
Maximum allowable clearance - Intake:
0,052 mm
Maximum allowable clearance - Exhaust:
0,062 mm
Valve standard length - Intake:
70,1 mm
Valve standard length - Exhaust:
69,2 mm
I I
NSPECTING THE SPRINGS AND HALF CONES NSPECTING THE SPRINGS AND HALF
Check that the upper spring caps and the cotter halves show
no signs of abnormal wear.
R R
EFITTING THE VALVES EFITTING THE VALVES
- Lubricate the valve guides with graphitized oil.
- Position the valve spring lower caps on the cylinder head.
- Using the specific drift, alternately insert the two seal
rings.
- Fit the valves, the springs and the upper caps.
- Using the specific tool, compress the springs and insert the
cotter halves into their seats.
Specific tooling
020306Y Valve oil seal fitting drift
020382Y Valve fitting/removing tool
33
- CYLINDER ASSY. AND TIMING SYSTEM
- CY LI ND ER ASS Y. A N D T IMI NG SYST EM
-
CONES