PIAGGIO Runner 125 - Choosing the gasket

Choosing the gasket
- Provisionally fit the piston into the cylinder, with-
out any base gasket.
- Assemble a dial gauge on the specific tool
Support to check piston position 020428Y
- Set the dial gauge to zero placing the tool on a
contrasting surface. Keeping the zero position, as-
semble the tool on the cylinder and lock it with 2
supplied nuts as shown in the figure.
- Rotate the crankshaft until TDC (the inverted
point of the dial gauge rotation)
- Position the dial gauge on the piston as shown in
the figure and measure how much the piston pro-
trudes.
- By means of the table shown in the specifications
chapter identify the cylinder base gasket thickness
to be used for refitting. Correctly identify the cylin-
der base gasket thickness to keep the correct
compression ratio.
- Remove the specific tool and the cylinder.
N.B.
PISTON PROTRUSION IS MEASURED IN 125 ENGINES
WHILE INTRODUCTION IS MEASURED IN 200 ENGINES.
Engine Runner 125 - 200
ENG - 160