PIAGGIO X9 Evolution 125 2008 - Piston and Cylinder Inspections

Inspecting the small end
- Measure the internal diameter of the small end
using an internal micrometer.
N.B.
REPLACE THE CRANKSHAFT IF THE DIAMETER OF THE
ROD SMALL END EXCEEDS THE STANDARD DIAMETER
OR IT SHOWS SIGNS OF WEAR OR OVERHEATING.
Characteristic
Rod small end check-up: Maximum diameter
15.030 mm
Rod small end check-up: Standard diameter
15+0.015+0.025 mm
Inspecting the wrist pin
- Measure the outer diameter of the gudgeon pin.
- Calculate the coupling clearance between pin
and connecting rod end.
Characteristic
Pin diameter: Standard clearance
0.015 ÷ 0.029 mm
Pin diameter Standard diameter
14.996 - 15.000 mm
Inspecting the piston
- Measure the diameter of the wrist pin seat on the
piston.
- Calculate the piston pin coupling clearance.
- Measure the outside diameter of the piston, per-
pendicular to the gudgeon pin axis.
- Measure at 41.1 mm from the piston crown in the
position shown in the figure.
- Carefully clean the seal housings.
- Measure the coupling clearance between the
seal rings and the grooves using suitable sensors,
as shown in the diagram.
X9 Evolution 125 Engine
ENG - 119