APRILIA SCARABEO 125 Service Manual page 70

Engine
Checking the bell working surface eccentricity
- Fit the bell on a driven pulley shaft with 2 bearings
(inside diameter: 15 and 17 mm).
- Lock with the original spacer and nut.
- Place the bell/shaft assembly on the support to
check the crankshaft alignment.
- Using a dial gauge and the magnetic base, meas-
ure the bell eccentricity.
- Repeat the measurement at 3 positions (Central,
internal, external).
- In case of faults, replace the bell.
Specific tooling
020074Y Support base for checking crankshaft
alignment
020335Y Dial gauge magnetic support
Characteristic
clutch bell check: Limit eccentricity.
Admissible limit eccentricity: 0.15 mm
Inspecting the clutch
- Check the thickness of the clutch mass friction
material.
- The masses must exhibit no traces of lubricants;
in that case, check the driven pulley unit seals.
NOTE
UPON RUNNING-IN, THE MASSES MUST EXHIBIT A CEN-
TRAL FAYING SURFACE AND MUST NOT BE DIFFERENT
FROM ONE ANOTHER.
DIFFERENT CONDITIONS MAY CAUSE CLUTCH TEAR-
ING.
CAUTION
DO NOT USE TOOLS TO OPEN THE MASSES TO AVOID
VARIATION IN THE RETURN SPRING LOAD.
Characteristic
Check minimum thickness
1 mm
ENG - 70
SCARABEO 125 - 200