7 - 12
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.
- 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
05_190
05_191
Piston assembly
- Assemble the piston and the gudgeon pin on the
connecting rod. Position the piston with the arrow
facing the exhaust.
05_189
Thermal unit and timing system
Standard opening Max value
Compression ring 0.15 - 0.35 mm 0.5 mm
Scraper ring 0.25 - 0.50 mm 0.65 mm
Scraper ring 0.25 - 0.50 mm 0.65 mm
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