VESPA LX 150 4T Euro 3 Service Station Manual page 102

Engine
Refitting the piston rings
- Place the oil scraper spring on the piston.
- Refit the oil scraper ring with the join of spring
ends on the opposite side from the ring gap and
the word 'TOP' towards the piston crown. The ta-
pered side of the middle piston ring should always
be facing away from the piston crown.
- Fit the middle piston ring with the identification
letter facing the piston crown. In any case, the step
must be facing opposite the piston crown.
- Fit the top piston ring with the word 'top' or the
reference mark facing the crown of the piston.
- Offset the piston ring gaps on the three rings by
120° to each other as shown in the figure.
- Lubricate the components with engine oil.
N.B.
SO AS TO OBTAIN THE BEST CONFIGURATION THE 2
SEALING RINGS ARE MADE WITH A CONTACT CONICAL
CYLINDER SECTION.
Refitting the cylinder
- Insert the cylinder base gasket with the thickness
determined above.
- Using the fork support and the piston ring retain-
ing band, refit the cylinder as shown in the figure.
N.B.
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW
OUT THE LUBRICATION DUCT AND OIL THE CYLINDER
LINER.
Specific tooling
020426Y Piston fitting fork
ENG - 102
Vespa LX 125 - 150 4T Euro 3