Husqvarna 243RJ Workshop Manual page 49

The piston scored and worn from the piston
ring down on the inlet side.
Extensive damage to the lower part of the
piston's inlet side.
Cylinder and piston
Larger, softer particles that penetrate into the engine cause damage to the piston skirt
under the piston ring as the illustration shows.
Cause:
• Air fi lter incorrectly fi tted.
• Air fi lter damaged or missing.
Larger, harder particles that enter the engine cause serious damage to the underside of
the piston skirt.
Cause:
• Air fi lter damaged or missing.
• Parts from the carburettor or intake
system have come loose and entered
the engine.
Action:
Fit the air fi lter correctly.
Fit a new air fi lter.
Action:
Fit a new air fi lter.
Regular service and inspection.
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