Derbi boulevard 125 4t Workshop Manual page 93

Engine
- Insert the driving belt into the pulley unit accord-
ing to their direction of rotation.
- Insert the pulley unit with the belt into the tool.
- Slightly preload the spring.
- Make sure that the clutch is perfectly inserted into
the adapter ring before proceeding to tighten the
clutch nut.
- Place the tool in the clamp with the control screw
on the horizontal axis.
- Fully preload the spring.
- Apply the clutch fixing nut and tighten it to the
prescribed torque using the special 46x55 wrench.
- Loosen the tool clamp and insert the belt accord-
ing to its direction of rotation.
- Lock the driven pulley again using the specific
tool.
- Preload the clutch return spring with a traction/
rotation combined action and place the belt in the
smaller diameter rolling position.
- Remove the driven pulley /belt unit from the tool.
N.B.
DURING THE SPRING PRELOADING PHASE,
BE CAREFUL NOT TO DAMAGE THE PLASTIC
SPRING STOP AND THE BUSHING THREAD-
ING.
N.B.
FOR DESIGN REASONS, THE NUT IS SLIGHT-
LY ASYMMETRIC; THE FLATTEST SURFACE
SHOULD BE MOUNTED IN CONTACT WITH
THE CLUTCH.
Specific tooling
020444Y Tool for fitting/ removing the driven
pulley clutch
020444Y011 adapter ring
020444Y009 46x55 Wrench
Locking torques (N*m)
Nut locking clutch unit on pulley 55 ÷ 60 Nm
ENG - 93