40 mm piston rings for 2-stroke Piaggio/Gilera 50 cc engines seal the piston in the cylinder and maintain compression.
- Replace them when compression drops, starting becomes difficult, or power is lost, and at every piston group overhaul.
- Before installing, check the ring end gap in the cylinder and the condition of the piston grooves.
- Align the ring gaps with the locating pins in the grooves.
If the cylinder has been rebored, you will need oversize rings; please confirm before ordering.
