Stihl KM 85 Instruction Manual - Page 24

Checking the Spark Plug

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Checking the Spark Plug english / USA Erratic idling behavior Idle setting too rich: : Turn low speed screw (L) clockwise (about 1/4 turn) until the engine runs and accelerates smoothly. 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. 000BA002 KN If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. : Remove spark plug - see "Starting / Stopping the Engine". : Clean dirty spark plug. : Check electrode gap (A) and readjust if necessary - see "Specifications". : 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. KM 85, KM 85 R 23

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23
KM 85, KM 85 R
english / USA
Erratic idling behavior
Idle setting too rich:
:
Turn low speed screw (
L
) clockwise
(about
1
/
4
turn) until the engine runs
and accelerates smoothly.
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.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
:
Remove spark plug - see “Starting /
Stopping the Engine“.
:
Clean dirty spark plug.
:
Check electrode gap
(A)
and
readjust if necessary – see
"Specifications".
:
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.
Checking the Spark Plug
000BA002 KN