Derbi Dirtboy 10 Workshop Manual page 20

E E ENGINE
E N G I N E
Specific tooling
020450Y Camshaft fitting/removing tool
004499Y Bearing extractor
Remove the rocker arm pivot through the hole on the flywhe-
el side and simultaneously remove the rocker arms.
N.B.
MARK THE INSTALLING POSITION OF EACH ROCKER ARM
SO AS TO AVOID FITTING THE INTAKE ROCKER ARM IN
PLACE OF THE EXHAUST ROCKER ARM OR VICE VERSA.
R R
EMOVING THE CYLINDER HEAD EMOVING THE CYLINDER HEAD
- Remove the timing assembly, the camshaft, and the rocker-
arms.
- Remove the spark plug.
- Remove the two side fastenings shown in the figure.
- Loosen the four cylinder head locknuts in two or three
phases following a crosswise pattern.
- Remove the cylinder head, the two dowel bolts and the
gasket.
N.B.
SHOULD IT BE NECESSARY, THE HEAD MAY BE REMOVED
WITH THE CAM SHAFT AND RACOKERARM PIN. IT SHOULD
BE REMEMBERED, HOWEVER, THAT IT IS THEN NECESSARY
TO HOLD THE CHAIN IN PLACE WITH A METALLIC WIRE AND
CARRY OUT THE CHAIN ADJUSTMENT WHEN REFITTING,
AS DESCRIBED IN THE PARAGRAPH "REFITTING THE TIMING
COMPONENTS".
- Ensure the chain correctly engages the timing gear-shaft
keyed to the crankshaft, on the flywheel-side.
20
- CYLINDER ASSY. AND TIMING SYSTEM
- CY LINDE R A SS Y. AN D T IMIN G S YST E M