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•
Use a screwdriver to remove dirt particles from the
cooling fins.
•
Clean all parts.
•
Examine all the parts for damage and wear.
Examine the piston and cylinder for damage and
To examine the piston on page 38
wear. Refer to
To examine the cylinder on page 39 .
and
•
Examine the piston pin.
a) If it is blue, it must be replaced.
b) If the piston moves too easily, the piston and the
piston pin must be replaced.
c) If the needle bearing has discoloration or
damages, replace it.
•
Examine the snap rings. If they have cracks or
discoloration, replace them.
7.12.4 To examine the piston
•
Make sure that the piston pin bearing is not
damaged.
•
Make sure that the piston pin does not have
damages on the surface against the bearing.
•
Make sure that the piston ring can move freely in the
groove.
38 - Repair instructions
•
Put the piston ring in the cylinder and measure the
space with an air gap tool. The space must not be
more than 1 mm.
•
Examine the surface of the piston.
A
Score marks on the pis-
ton (A).
Carbon buildup (B).
Piston ring damage.
B
The carburetor is incor-
rectly adjusted. Too high
engine speed
Too low octane fuel.
Incorrect oil mixture in
the fuel.
The carburetor is incor-
rectly adjusted.
Incorrect oil mixture in
the fuel.
Too high engine speed.
Piston ring worn out.
Too large piston ring
groove.
911 - 001 - 15.02.2019
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