The lock washer should be replaced with a new one after each disassembly of the flywheel nut.
The lock washer prevents the flywheel nut from loosening, which could ultimately lead to serious engine damage.
The lock washer fits Vespa models such as:
- PK 50 S-XL2
- V50, V50 Special
- PV 125, ET3
- PX 80/125/200 (old and lusso)
- Cosa
- Sprint
- and more.
