PIAGGIO B 250 - Page 121

Driving pulley removal (125)
- With the appropriate tool, remove the nut with the
built-in Belleville washer, the drive common to the
kick-starter version, and the steel washer.
- Remove the fixed driving half-pulley.
- Remove the steel washer separating from the
bushing.
Appropriate tools:
Specific tooling
020368Y driving pulley lock wrench
Inspecting the rollers case
- Ensure the internal bearing, shown in the figure,
is not abnormally worn and measure the internal
diameter.
- Measure the external diameter of the pulley slid-
ing bushing, shown in the figure.
- Ensure rollers are not damaged or worn.
- Ensure the roller plate shoes are not damaged.
- Check the wear of the roller housings and of the
belt contact surfaces on both half-pulleys.
- Ensure the fixed driving pulley exhibits no abnor-
mal wear on the grooved profile and on the belt
contact surface.
- Ensure the O-ring is not deformed.
CAUTION
DO NOT LUBRICATE OR CLEAN SINTERED BUSHINGS
Characteristic
Movable driving half-pulley bushing: Standard
Diameter
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
B 125-250 Engine
ENG - 121