Removing The Piston; Choosing The Gasket - PIAGGIO Liberty 125 Workshop Manual

Engine

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 stop ring onto the appropriate tool.
Specific tooling
020430Y Pin lock fitting tool
- With the opening in position indicated on the tool,
take stop ring in the closed position using the
punch.
- Fit the wrist pin stop using the plug as shown in
the figure
N.B.
THE TOOL FOR INSTALLING THE STOP RINGS MUST BE
USED MANUALLY.
CAUTION
USING A HAMMER TO POSITION THE RINGS CAN DAM-
AGE THE LOCKING HOUSING.

Choosing the gasket

- Provisionally fit the piston into the cylinder, without any base gasket.
- Assemble a dial gauge on the specific tool
- Set the dial gauge to zero at a contrast plane with an average precharge, for example 5 mm. Keeping
the zero setting position, fit the tool on the cylinder and lock it with 2 nuts, as shown in the figure.
- Rotate the crankshaft until TDC (the inverted point of the dial gauge rotation)
- Calculate the difference between the two measurements: use the chart below to identify the thickness
of the cylinder base gasket to be used for refitting. The proper identification of the cylinder base gasket
thickness allows maintaining the correct compression ratio.
- Remove the special tool and the cylinder.
ENG - 96
Liberty 125 - 200 4tempi