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17 Spark Plug
16.1
Adjusting Idle Speed
Engine stops while idling
► Warm up the engine for about 3 minutes.
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting attachment must not run.
Cutting attachment runs when engine is idling
► Turn the idle speed screw (LA) slowly counter‐
clockwise until the cutting attachment stops
running and then turn the screw about another
1/2 to 3/4 turn in the same direction.
WARNING
If the cutting attachment continues to run when
the engine is idling, have your machine checked
and repaired by your servicing dealer.
17 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
17.1
Removing the Spark Plug
2
► Remove the cover (1).
► Pull off the spark plug boot (2).
0458-433-0121-B
1
3
► Unscrew the spark plug (3).
17.2
Checking the Spark Plug
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
WARNING
Arcing may occur if the adapter nut (1) is loose
or missing. Working in an easily combustible or
explosive atmosphere may cause a fire or an
explosion. This can result result in serious inju‐
ries or damage to property.
► Use resistor type spark plugs with a properly
tightened adapter nut.
17.3
Installing the Spark Plug
► Screw the spark plug (3) into the cylinder.
► Tighten down the spark plug (3) with the com‐
bination wrench.
► Press the boot (2) firmly onto the spark plug.
► Fit the cover (1) and screw it down firmly.
18 Storing the Machine
For periods of about 3 months or longer
English
A
1
29
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