Spark Arresting Screen In Muffler; Spark Plug - Stihl FC 90 Manual De Instrucciones

Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
N If the engine is down on power,
check the spark arresting screen in
the muffler.
N Wait for the muffler to cool down.
N Move the slide control to STOP-0.
N Take out the screw (1).
3
2
N Take out the screws (2) and remove
the shroud (3).
FC 90
N Take out the screw (4).
N Lift the spark arresting screen (5)
and pull it out.
N
Clean the spark arresting screen. If
the screen is damaged or heavily
1
carbonized, fit a new one.
N Refit the spark arresting screen.
N Insert the screw and tighten it down
firmly.
N Fit the shroud.
2

Spark Plug

If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
Removing the spark plug
N Move the slide control to STOP-0.
1
N Pull off the spark plug boot (1).
N Unscrew the spark plug.
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