Stihl FS 350, Instruction Manual, Page: 79 / 96

FS 300, FS 350, FS 380
English
77
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 off the engine.
N
Pull off the spark plug boot (1).
N
Unscrew the 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
Screw the spark plug (2) into the
cylinder and fit the boot (1) (press it
down firmly).
Spark Plug
250BA054 KN
000BA039 KN
A
1
000BA045 KN
2
002BA446 KN
1