PIAGGIO Runner 125 - Refitting the driving pulley

- Check the wear of the roller housings and of the
belt contact surfaces on both pulley halves.
- Check that stationary driving pulley does not
show signs of abnormal wear on the grooved edge
and on the surface in contact with the belt.
- Check that the O-ring is not pushed out of shape.
CAUTION
DO NOT LUBRICATE OR CLEAN SINTERED BUSHINGS
Characteristic
Roller: Minimum diameter permitted
Ø 18.5 mm
Sliding bushing: Minimum admissible diame-
ter
Ø 25.95 mm
Movable driving half-pulley bushing: Maxi-
mum allowable diameter
Ø 26.12 mm
Roller: Standard Diameter
Ø 18.9 ÷ 19.1 mm
Sliding bushing: Standard Diameter
Ø 25.959 ÷ 25.98 mm
Movable driving half-pulley bushing: Standard
Diameter
26.000 - 26.021 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 Runner 125 - 200
ENG - 138