VESPA 633844 IT Service Manual page 109

Vespa GTV 250 i.e.
26.000 - 26.021 mm
Movable driving half-pulley bushing: Maxi-
mum allowable diameter
Ø 26.12 mm
Sliding bushing: Standard Diameter
Ø 25.959 ÷ 25.98 mm
Sliding bushing: Minimum admissible diame-
ter
Ø 25.95 mm
Roller: Standard Diameter
Diameter 20.5 - 20.7 mm
Roller: Minimum diameter permitted
Ø 20 mm
Refitting the driving pulley
- Preassemble the movable half-pulley with the
roller contrast plate by putting the rollers in their
housings with the larger support surface touching
the pulley according to the direction of rotation.
- Check that the roller contact plate does not have
flaws and is not damaged on the grooved edge.
- Mount the complete bushing unit on the driving
shaft.
- Fit the driven pulley/Clutch/belt unit on the en-
gine.
Engine
ENG - 15