VESPA LX 4T USA Workshop Manual page 92

Engine
- Fit the oil scraper ring starting from the spring,
taking care that the spring ends do not superim-
pose. Fit the two piston rings so that their gaps and
that of the oil scraper ring are never aligned.
- Fit the 2nd sealing ring with the identifying letter
«T» facing towards the piston crown.
- Fit the 1st sealing ring with the reference letter
«T» facing towards the piston crown.
- Offset the ring gaps by 120° to each other as
shown in the figure.
- Lubricate the components with engine oil.
N.B.
IN ORDER TO OBTAIN A GOOD BEDDING, THE 2 SEALING
PISTON RINGS ARE MADE OF CONE SHAPED CONTACT
SECTION TO THE CYLINDER. AS A RESULT IT IS IMPOR-
TANT TO RESPECT THE FITTING INSTRUCTION TO AS-
SEMBLY THE RINGS WITH THE "T" MARK FACING
UPWARDS.
Refitting the cylinder
- Insert the cylinder base gasket.
- Fit the cylinder as shown in the figure.
- It is possible to maintain the piston out of the
crankcase plane using the special tool.
N.B.
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW
OUT THE LUBRICATION DUCT AND OIL THE CYLINDER
BARREL.
Specific tooling
020288Y Fork to assemble piston on cylinder
When replacing the four cylinder studs, on this engine, the head nuts must be tightened according to
the procedure below.
This differs from what is specified on the vehicle's manual:
ENG - 92
LX 4T USA