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Spark Plug
If the engine is down on power, difficult
to start or runs poorly at idling speed,
first check the spark plug.
Install a new spark plug after approx.
100 operating hours or earlier if the
electrodes are badly eroded/corroded.
The 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 degrade performance.
Removing the Spark Plug
1
Rotate the screw (1) in the cap (2)
N
until the screw head projects from it.
40
3
Lift the front of the cap (2) and push
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it to the rear to disengage.
Put the cap to one side.
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Remove the spark plug boot (3).
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Unscrew the spark plug.
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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.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
A
WARNING
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press the spark plug
boot (1) snugly onto the spark plug
terminal (2).
1
3
2
FS 510 C, FS 560 C
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