3
100
ENGINE CHECKS AND ASSEMBLY
3.12.7 CHECK OF CRANKCASE/
CYLINDER GASKET THICK-
NESS
The thickness of the gasket between the cylinder
and crankcase must be checked every time the
following are replaced:
∙ Cylinder;
∙ Piston;
∙ Crankshaft;
∙ Connecting rod;
∙ Crankcase.
The check is necessary as said thickness affects
engine performance. The check must be carried
out using the specific calibrated plates set out in
the table.
The use of the plates is described below.
• Place the specific plate making sure it comes
into contact with the cylinder's upper surface.
• Move the piston to top dead centre and, using
a thickness gauge, check the play between
piston and plate is between 0÷0.05mm.
If the play between piston and plate is higher
than required, reduce the cylinder/crankcase gas-
ket thickness and carry out the check again.
Displacement [cm³] Model Year Code Side
250
2022 026.14.017.00.00
B
300 A
Case where the plate and piston do not touch: check
distance between plate and piston.
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