Spark Plug - Stihl KM 90 R Instruction Manual

English
Take out the screw (4).
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Lift the spark arresting screen (5)
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and pull it out.
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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Insert screw and tighten it down
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firmly.
Install the shroud.
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16

Spark Plug

If the engine is down on power,
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difficult to start or runs poorly at idle
speed, first check the spark plug.
Fit a new spark plug after about 100
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operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the spark plug
Move the slide control to STOP-0.
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1
Pull off the spark plug boot (1).
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Unscrew the spark plug.
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Checking the spark plug
Clean dirty spark plug.
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Check electrode gap (A) and
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readjust if necessary – see
"Specifications".
Rectify the problems which have
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caused fouling of the spark plug.
Possible causes are:
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
–
WARNING
If the spark plug comes with a
detachable adapter nut (1), screw the
adapter onto the thread and tighten it
down firmly to reduce the risk of arcing
and fire.
A
1
KM 90 R