STANDARD COUPLING CLEARANCE
Name Description Dimensions Initials Quantity
Top piston ring 0.025 to 0.070
Middle piston ring 0.015 to 0.060
oil scraper 0.015 to 0.060
MAXIMUM ADMITTED CLEARANCE AFTER USE
Name Description Dimensions Initials Quantity
Top piston ring 0.080 mm
Middle piston ring 0.070 mm
oil scraper 0.070 mm
Removing the piston
- Install piston and wrist pin onto the connecting
rod, aligning the piston arrow the arrow facing to-
wards the exhaust.
- Fit the pin retainer ring onto the appropriate tool.
Specific tooling
020430Y Pin lock fitting tool
- With the opening in position indicated on the tool,
take retainer ring in the closed position using the
punch.
- Fit the wrist pin snap ring using the plug as shown
in the figure
N.B.
THE TOOL FOR INSTALLING THE RETAINER RINGS MUST
BE USED MANUALLY.
CAUTION
USING A HAMMER TO POSITION THE RINGS CAN DAM-
AGE THE LOCKING HOUSING.
Engine Vespa LX 125 - 150 i.e.
ENG - 118
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