Piston Assembly - PIAGGIO 500 cc Service Manual

Thermal unit and timing system
Compression ring
Scraper ring
Scraper ring
N.B.: Before replacing the rings, make sure that the instructions regarding the ring-slot and piston-cylinder
allowances have been followed. However, the bedding of new rings on secondhand cylinders may differ from the
standard bedding conditions.

Piston assembly

- Assemble the piston and the gudgeon pin on the
connecting rod. Position the piston with the arrow
facing the exhaust.
- Insert the gudgeon pin stop ring in the specific tool,
with the opening in the position marked on the tool.
S = left
D = right
- Fit the stop ring by means of the punch
7 - 12
Standard opening
0.15 - 0.35 mm
0.25 - 0.50 mm
0.25 - 0.50 mm
Max value
0.5 mm
0.65 mm
0.65 mm
05_189
05_190
05_191