Spark Arresting Screen In Muffler; Spark Plug - Stihl MS 311 Manual De Instrucciones

Spark Arresting Screen in
Muffler
If the engine is down on power,
N
check the spark arresting screen in
the muffler.
Wait for the muffler to cool down.
N
Take out the four screws.
N
Remove the muffler exhaust
N
casing (1).
2
3
Bend back the retaining tabs (2).
N
Pull out the spark arresting
N
screen (3).
Clean the spark arresting screen. If
N
the screen is damaged or heavily
carbonized, fit a new one.
Refit the spark arresting screw in
N
the reverse sequence.
MS 311, MS 391

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.
Remove the spark plug
Move the Master Control lever to the
N
stop position 0
Push the hand guard forwards – the
N
saw chain is blocked
2
1
Loosen screws (1)
N
Remove the shroud (2)
N
Pull off the spark plug boot
N
Unscrew spark plug
N
Checking the spark plug
Clean the spark plug if it is dirty
N
1
Check the electrode gap (A) and
N
readjust if necessary – see
"Specifications"
Use only resistor type spark plugs of
N
the approved range
Correct the problems that have caused
1 fouling of the spark plug:
too much oil in fuel mix,
–
dirty air filter,
–
unfavorable running conditions, e.g.
–
operating at part throttle.
English
A
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