Spark Arresting Screen In Muffler; Checking The Spark Plug - Stihl MS 192 Instruction Manual

NOTICE
After returning from high altitude, reset
the carburetor to the standard setting.
If the setting is too lean there is a risk of
engine damage due to insufficient
lubrication and overheating.
MS 192 C
Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
If the engine is down on power,
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check the spark arresting screen in
the muffler.
Wait for the muffler to cool down.
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Remove the sprocket cover.
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Take out the screw (1).
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Remove the baffle plate (2).
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Remove the spark arresting
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screen (3).
Clean the spark arresting screen. If
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the screen is damaged or heavily
carbonized, fit a new one.
Refit the spark arresting screen.
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Fit the baffle plate.
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Checking the Spark Plug

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.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Remove spark plug – see "Starting /
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Stopping the Engine".
Clean dirty spark plug.
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Check electrode gap (A) and
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readjust if necessary – see
"Specifications".
Use only resistor type spark plugs of
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the approved range.
Rectify problems which have caused
fouling of spark plug:
Too much oil in fuel mix.
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Dirty air filter.
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Unfavorable running conditions,
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e.g. operating at part load.
English
A
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