Piston Rings - PIAGGIO X9 Evolution 500 Workshop Manual

X9 Evolution 500
Cylinder - piston assy.
(Values in mm)
HEIGHT AT WHICH THE DIAMETER SHOULD BE MEASURED
Specification
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.

Piston rings

* Fit rings «2» and «3» with the word «TOP» facing upwards.
** Position the openings in the rings as shown here.
*** Value «A» of sealing ring inside the cylinder
**** Ring opening
A:
B:
CATEGORIES OF COUPLING
Initials Cylinder
A 91.990 - 91.997
B 91.997 - 92.004
C 92.004 - 92.011
D 92.011 - 92.018
Characteristics
Desc./Quantity
10 mm
43 mm
Piston Play on fitting
91.954 - 91.961 0.029 - 0.043
91.961 - 91.968 0.029 - 0.043
91.968 - 91.975 0.029 - 0.043
91.975 - 91.982 0.029 - 0.043
CHAR - 15