Inspecting The Cylinder; Inspecting The Piston Rings - Gilera Runner RSTPurejet Service Manual

Engine
- Measure the outer diameter of the piston, per-
pendicular to the pin axis.
- Take the measurement in the position shown in
the figure
To classify the cylinder-piston fitting, check the ap-
propriate table
See also
Cylinder - piston assy.

Inspecting the cylinder

• Check that the cylinder exhibits no seizure. If it
does, replace or adjust it, while respecting the al-
lowable oversizes.
• Use a bore meter to measure the cylinder inside
diameter according to the directions shown in the
figure.
• Check that the fitting surface with the head is not worn or deformed
To classify the fitting, refer to the tables.
See also
Cylinder - piston assy.

Inspecting the piston rings

• Alternatively, insert the 2 sealing rings into the
cylinder.
• Insert the rings in an orthogonal position relative
to the cylinder axis, using the piston.
• Measure the sealing ring opening by a feeler
gauge, as shown in the figure.
• If the values are higher than those prescribed on the chart, replace the rings
ENG - 22
Runner RST Purejet