PIAGGIO Beverly Tourer 300 i.e. Service Station Manual page 14

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 - 14
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
Beverly Tourer 300 i.e.
Desc./Quantity
74.967 +0.014 -0.014 mm
75 +0.038 +0.01 mm
Piston Play on fitting
74.953 ÷ 74.960 0.050 ÷ 0.064
74.960 ÷ 74.967 0.050 ÷ 0.064
74.967 ÷ 74.974 0.050 ÷ 0.064
74.974 ÷ 74.981 0.050 ÷ 0.064