Vespa LX 2012 - Page 15

- Measure the outer diameter of the gudgeon pin.
Characteristic
Pin outside diameter
14 (+0 -0.004) mm
- Measure the diameter of the housings on the pis-
ton.
Characteristic
Standard diameter
14 (+0.006 +0.001) mm
- Carefully clean the seal housings.
- Measure the coupling clearance between the
sealing rings and the piston grooves using suitable
sensors, as shown in the diagram.
- If the clearance is greater than that indicated in
the table, replace the piston.
- Check the clearance upon mounting (A) of the
bands:
N.B.
MEASURE THE CLEARANCE BY INSERTING THE BLADE
OF THE FEELER GAUGE FROM THE SECOND SEAL RING
SIDE.
ASSEMBLY CLEARANCE OF BANDS - SEAL RINGS (125)
DESIGNATION
SIZES ASSEMBLY CLEARANCES (A)
1° compression ring (mm) 52x0.8 0.20 to 0.35
2° compression ring (mm) 52x1.0 0.20 to 0.45
Oil ring segments (mm) 52x2.0 0.25 to 0.55
ASSEMBLY CLEARANCE OF BANDS - SEAL RINGS (150)
DESIGNATION
SIZES ASSEMBLY CLEARANCES (A)
1° compression ring (mm) 58x0.8 0.20 to 0.35
2° compression ring (mm) 58x1.0 0.20 to 0.45
Oil ring segments (mm) 58x2.0 0.25 to 0.55
- Check that the head coupling surface is not worn or misshapen.
Vespa LX - S 125 3V ie 150 3V ie (2012) Characteristics
CHAR - 15