HL 91 K
English
16
N If the engine is down on power,
difficult to start or runs poorly at idle
speed, first check the spark plug.
N 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
"Specifications".
Removing the spark plug
N Turn screw (1) in cap (2) until cap
can be removed
N Lay down cap
N Pull off the spark plug boot (3)
N Unscrew spark plug,
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
caused fouling 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 injuries or
damage to property.
N Use resistor type spark plugs with a
properly tightened adapter nut.
Installing the Spark Plug
N Fit the spark plug and tighten it
down firmly.
N Press the boot firmly onto the spark
plug.
N Fit the cap (1), insert the screw (2)
and tighten it down firmly.
Spark Plug
1
0208BA037 KN
2
3
0208BA038 KN
1
2
0208BA039 KN
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