Stihl HL 75 K Instruction Manual - Page 25

Spark Arresting Screen* in Muffler, Checking the Spark Plug, Fit a new spark plug after approx. 100

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English / USA Spark Arresting Screen* in Muffler Checking the Spark Plug If the engine is low on power, check the spark arresting screen in the muffler. : Lift spark arresting screen and pull it out sideways. : Clean spark arresting screen if necessary. : If screen is damaged or coked up, fit a new one. : Refit the spark arresting screen. 392BA035 KN 000BA002 KN 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. * see "Guide to Using this Manual" 24 HL 75, HL 75 K

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24
English / USA
HL 75, HL 75 K
If the engine is low on power, check the
spark arresting screen in the muffler.
:
Lift spark arresting screen and pull it
out sideways.
:
Clean spark arresting screen if
necessary.
:
If screen is damaged or coked up, fit
a new one.
:
Refit the spark arresting screen.
*
see “Guide to Using this Manual”
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.
Spark Arresting Screen* in
Muffler
392BA035 KN
Checking the Spark Plug
000BA002 KN