VESPA 946 E4 EMEA 2021 Manual page 140

Engine
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.
N.B.
UPON RUNNING-IN, THE MASSES MUST EXHIBIT A CEN-
TRAL FACING SURFACE AND MUST NOT BE DIFFERENT
FROM ONE ANOTHER.
VARIOUS CONDITIONS CAN CAUSE THE CLUTCH TO
TEAR.
CAUTION
DO NOT USE TOOLS TO OPEN THE MASSES TO AVOID
VARIATION IN THE RETURN SPRING LOAD.
Characteristic
Check minimum thickness
1 mm
Pin retaining collar
- Simultaneously turn and pull the collar manually
to remove it.
N.B.
USE TWO SCREWDRIVERS IF YOU HAVE ANY DIFFICUL-
TY.
N.B.
BE CAREFUL NOT TO PUSH THE SCREWDRIVERS IN TOO
FAR TO AVOID DAMAGE THAT COULD COMPROMISE
THE O-RING SEAL.
Inspecting the driven fixed half-pulley
- Measure the outside diameter of the pulley bush-
ing.
Characteristic
Standard diameter:
Ø 40.1 ± 0.05 mm
ENG - 140
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)