Choosing The Gasket - Gilera Runner RST 50 SP Service Station Manual

Runner RST 50 SP

Choosing the gasket

• Temporarily fit the cylinder on the piston, without
the basic gasket.
• Fit a dial gauge on the specific tool, using the
short union as shown in the figure.
Use a reference plane to reset the dial gauge with
a pre-load of a few millimetres.
Set the dial gauge.
Check that tracer slides smoothly.
Fit the tool on the cylinder without changing the
dial gauge position.
Lock the tool by the nuts used to secure the head.
Turn the engine shaft to the dead centre position (dial gauge rotation inversion point).
Measure the difference with the reset value.
Refer to the table to identify the thickness of the cylinder base gasket to use for refitting. The correct
identification of the thickness of the cylinder base gasket allows maintaining the correct compression
ratio.
Remove the specific tool and the cylinder.
Specific tooling
020272Y Piston position check tool
See also
Cylinder - piston assy.
Engine
ENG - 89