Checking The Spark Plug - Stihl BG 45 Instruction Manual

Standard setting
:
Check the air filter and replace if
necessary.
:
Start and warm up the engine.
: Carefully screw the idle speed
screw (LD) down onto its seat
counterclockwise (left-hand thread).
Then open it two full turns clockwise
(standard setting).
Adjusting idle speed
Engine stops when engine is idling:
Carry out standard setting
(open the LD screw two full turns)
:
Rotate idle speed screw (LD) about
one half turn clockwise until the
engine runs smoothly.
Erratic idling behavior, poor
acceleration:
Carry out standard setting
(open the LD screw two full turns)
:
Rotate idle speed screw (LD) about
one half turn counterclockwise.
BG 45

Checking the Spark Plug

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.
english / USA
If engine is down on power, difficult
to start or runs poorly at idling speed,
first check the spark plug.
:
Remove spark plug as discribed
in chapter "Starting"
: Clean dirty spark plug.
:
Check electrode gap (A) -
it should be 0.5mm/0.02" -
readjust if necessary.
:
Use only resistor type spark plugs
of the approved range.
Rectify problems which have caused
fouling of spark plug:
:
Too much oil in fuel mix.
: Dirty air filter.
: Unfavorable running conditions,
e.g. operating at part load.
Fit a new spark plug after approx. 100
operating hours
or earlier if the electrodes are badly
eroded.
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