PIAGGIO Beverly 300 i.e., Service Station Manual, Page: 14 / 333

CYLINDER - PISTON
Specification Desc./Quantity
Plunger diameter 74.967 +0.014 -0.014 mm
Cylinder diameter 75 +0.038 +0.01 mm
COUPLING CATEGORIES
Name Initials Cylinder Piston Play on fitting
cylinder-piston M 75.01 ÷ 75.017 74.953 ÷ 74.960 0.050 ÷ 0.064
cylinder-piston N 75.017 ÷ 75.024 74.960 ÷ 74.967 0.050 ÷ 0.064
cylinder-piston O 75.024 ÷ 75.031 74.967 ÷ 74.974 0.050 ÷ 0.064
cylinder-piston P 75.031 ÷ 75.038 74.974 ÷ 74.981 0.050 ÷ 0.064
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
Characteristics
Beverly Tourer 300 i.e.
CHAR - 14