VESPA GTS Super 300 ie 2008 Service Station Manual page 18

Characteristics
Specification
Plunger diameter
Cylinder diameter
Name
cylinder-piston
cylinder-piston
cylinder-piston
cylinder-piston
N.B.
THE PISTON MUST BE INSTALLED WITH THE ARROW FACING TOWARDS THE EXHAUST SIDE,
THE PISTON RINGS MUST BE INSTALLED WITH THE WORD «TOP» OR THE STAMPED MARK
FACING UPWARDS.
- Measure the outer diameter of the gudgeon pin.
Characteristic
Pin outside diameter
16 +0 -0.004 mm
- Measure the diameter of the bearings on the pis-
ton.
Characteristic
Standard diameter
16 +0.006 +0.001 mm
- Calculate the piston pin coupling clearance.
N.B.
THE PIN HOUSINGS HAVE 2 LUBRICATION CHANNELS. FOR THIS REASON, MEASUREMENT
MUST BE MADE ACCORDING TO THE PISTON AXIS
Characteristic
Standard clearance:
0.001 - 0.010 mm
CHAR - 18
CYLINDER - PISTON
COUPLING CATEGORIES
Initials Cylinder
M 75.01 ÷ 75.017
N 75.017 ÷ 75.024
O 75.024 ÷ 75.031
P 75.031 ÷ 75.038
Vespa GTS Super 300 ie (2008)
Desc./Quantity
74.967 +0.014 -0.014 mm
75 +0.038 +0.01 mm
Piston
74.953 ÷ 74.960
74.960 ÷ 74.967
74.967 ÷ 74.974
74.974 ÷ 74.981
Play on fitting
0.050 ÷ 0.064
0.050 ÷ 0.064
0.050 ÷ 0.064
0.050 ÷ 0.064