Stihl MS 171 Product Instruction Manual - Page 44

Spark Plug

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000BA039 KN English A slight correction of the setting may be necessary if the engine does not run satisfactorily: N Check the standard setting. N Warm up the engine. N Turn high speed screw (H) slightly clockwise (leaner) - no further than stop. If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating. Spark Plug Checking the Spark Plug If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. 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. Removing the spark plug N Remove the shroud - see "Shroud". A N Clean dirty spark plug. N Check electrode gap (A) and readjust if necessary - see "Specifications". N 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. 533BA007 KN N Pull off the spark plug boot. N Unscrew the spark plug. 42 MS 171, MS 181, MS 181 C, MS 211, MS 211 C

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MS 171, MS 181, MS 181 C, MS 211, MS 211 C
English
42
A slight correction of the setting may be
necessary if the engine does not run
satisfactorily:
N
Check the standard setting.
N
Warm up the engine.
N
Turn high speed screw (H) slightly
clockwise (leaner) – no further than
stop.
If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours
or earlier if the
electrodes are badly eroded.
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.
Removing the spark plug
N
Remove the shroud – see "Shroud".
N
Pull off the spark plug boot.
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
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.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
Spark Plug
533BA007 KN
000BA039 KN
A