Removing The Piston; Choosing The Gasket - APRILIA SR MAX 125 ie Service Station 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 retainer ring onto the appropriate tool
- With opening in the position indicated on the tool
S = left
D= right
- Place the wrist pin retainer ring into position using
a punch
- Fit the wrist pin retainer ring using the plug as
shown in the figure
NOTE
THE TOOL FOR INSTALLING THE RETAINER RINGS MUST
BE USED MANUALLY.
CAUTION
USING A HAMMER MIGHT DAMAGE THE STOPS' HOUS-
ING.
Specific tooling
020430Y Pin lock fitting tool

Choosing the gasket

- Provisionally fit the piston into the cylinder, without any base gasket.
- Install a dial gauge on the special tool using the short union, as shown in the figure.
Specific tooling
020475Y Piston position checking tool
ENG - 132
SR MAX 125 ie