APRILIA Atlantic 300 Service Station Manual page 131

ATLANTIC 300 i.e.
Refitting the piston rings
•
Place the oil scraper spring on the pis-
ton.
•
Fit the oil scraper ring keeping the port
opposite 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 iden-
tification letter or the word "top" facing
the piston crown. In any case, the ta-
pered side of the ring must be facing
opposite the piston crown.
•
Fit the top piston ring with the word
"top" or the reference mark facing the
piston crown.
•
Offset the piston ring ports on the three
rings by 120º as shown in the figure.
•
Lubricate the components with engine
oil.
•
Engines are fitted with top ring with an
L section.
NOTE
THE 2 PISTON RINGS ARE MADE WITH A TAPERED CY-
LINDRICAL CONTACT SECTION. THIS IS TO OBTAIN A
BETTER BEDDING.
Refitting the cylinder
- Fit the cylinder base gasket of the chosen thick-
ness.
- Using the fork support and the retaining clamp,
fit the cylinder as shown in the figure.
NOTE
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW
AIR INTO THE LUBRICATION DUCT AND LUBRICATE THE
CYLINDER LINER.
Specific tooling
Engine
ENG - 131