APRILIA MSS Mana GT ABS Service Station Manual page 200

Engine
- Fit the pin snap ring in the specific tool, with the
opening in the position indicated on the tool.
S = left
D = right
- Set the snap ring into its position with the punch.
- Fit the pin snap ring with the pin as shown in the
figure.
Specific tooling
020470Y Pin snap ring fitting tool
NOTE
THE TOOL FOR INSTALLING THE RETAINER RINGS MUST BE USED MANUALLY.
CAUTION
USING A HAMMER MAY DAMAGE THE RINGS HOUSINGS.
Refitting the piston rings
- Place the oil scraper ring spring on the piston.
- Fit the oil scraper ring keeping the gap opposed
to the spring union and the word "top" facing the
piston crown. In any case, the chamfered side of
the must be facing the piston crown.
- Fit the middle piston ring with the identification
letter or the word "top" facing the piston crown. In
ENG - 200
MSS Mana GT ABS