Assembly Plays; Mating Between Piston And Cylinder; Piston Rings - PIAGGIO X9 500 cc Service Manual

Assembly plays

Mating between piston and cylinder

PART
Cylinder
Ø C
Piston
Ø P
The piston must be fitted so that the arrow faces the exhaust side. The piston rings must be fitted so that the marks
face upwards.

Piston rings

Assemble the rings
2 and 3 with the
"Top" writing facing
upwards.
PART
1st Compression ring
2nd Compression ring
Scraper ring
DIMENSIONS
CODE
- 0.010
92 A
+ 0.018
B
+ 0.014
91.961 C
- 0.014
D
DIMENSIONS
92 x 1.5
92 x 1.25
92 x 2.5
MATING CLASSES
CYLINDER
91.990 - 91.997 91.947 - 91.954
91.997 - 92.004 91.954 - 91.961
92.004 - 92.011 91.961 - 91.968
92.011 - 92.018 91.968 - 91.975
Ring opening
Arrange for the
piston rings
opening as shown
in the figure
CLEARANCE
CODE
A
A
A
Vehicle overhaul data
(Values in mm)
DIAMETER
A
MEASURING
B
HEIGHT
(Values in mm)
ASSEMBLY
PISTON CLEARANCE
0.036
-
0.050
"A" value of the ring
inside the cylinder
(Values in mm)
SEAT CLEARANCE
CLEARANCE AFTER USE
0.15 - 0.35 0.5
0.25 - 0.50 0.65
0.25 - 0.50 0.65
1
43.2
43
01_004
01_005
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