VESPA 664787 Service Station Manual page 76

Engine
the metallic insert does not come out of the plastic
shell borders.
4) Check the integrity of the sliding blocks of the
contact plate.
- Check that the internal bushing shown in the fig-
ure is not abnormally worn and measure inside
diameter «A».
- Measure outside diameter «B» of the pulley slid-
ing bushing shown in the figure.
CAUTION
DO NOT LUBRICATE OR CLEAN THE BUSHING.
Characteristic
Driving pulley / Maximum diameter:
20.12 mm
Driving pulley/ Standard diameter:
20.021 mm
Driving pulley bushing/ Diameter maximum:
XXX mm
Driving pulley bushing/ Standard diameter:
20 -0.020/-0.041mm
Refitting the driving pulley
- Manually move the movable driven half-pulley
away by pulling it towards the clutch unit and insert
the belt observing the direction of rotation of the
first fitting.
N.B.
IT IS GOOD PRACTICE ALWAYS TO FIT THE BELT SO
THAT THE WORDS CAN BE READ IN CASE IT DOES NOT
SHOW A FITTING SIDE.
ENG - 76
Vespa S 50 2T