Stihl MS 441 C-M MAGNUM174 Product Instruction Manual - Page 46

Spark Arresting Screen in, Muffler, Spark Plug

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English Spark Arresting Screen in Muffler In some countries, the muffler is fitted with a spark arresting screen. N If engine performance deteriorates, check the spark arresting screen in the muffler N Let the muffler cool down N Remove screw (1) N Pull out spark arresting screen (2) N Clean the dirty spark arresting screen, replace if damaged or heavily carbonized N Refit the spark arresting screen N Insert and tighten down the screw Spark Plug If the engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Install a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded/corroded. The 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 degrade performance. Removing the spark plug N Move the Master Control lever to the stop position (0). N Use the combination wrench to open the fasteners (1) in the direction of the arrow. N Remove the carburetor box cover (2). N Pull off the spark plug boot (3). N Unscrew the spark plug. Checking the spark plug A N Clean the spark plug if it is dirty N Check the electrode gap (A) and readjust if necessary - see "Specifications" N Use only resistor type spark plugs of the approved range Correct the problems that have caused fouling of the spark plug: - too much oil in fuel mix, - dirty air filter, - unfavorable running conditions, e.g. operating at part throttle. 000BA039 KN 44 MS 441 C-M

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MS 441 C-M
English
44
In some countries, the muffler is fitted
with a spark arresting screen.
N
If engine performance deteriorates,
check the spark arresting screen in
the muffler
N
Let the muffler cool down
N
Remove screw (1)
N
Pull out spark arresting screen (2)
N
Clean the dirty spark arresting
screen, replace if damaged or
heavily carbonized
N
Refit the spark arresting screen
N
Insert and tighten down the screw
If the engine is down on power, difficult
to start or runs poorly at idling speed,
first check the spark plug.
Install a new spark plug after approx.
100 operating hours or earlier if the
electrodes are badly eroded/corroded.
The 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 degrade performance.
Removing the spark plug
N
Move the Master Control lever to the
stop position (
0
).
N
Use the combination wrench to
open the fasteners (1) in the
direction of the arrow.
N
Remove the carburetor box
cover (2).
N
Pull off the spark plug boot (3).
N
Unscrew the spark plug.
Checking the spark plug
N
Clean the spark plug if it is dirty
N
Check the electrode gap (A) and
readjust if necessary – see
"Specifications"
N
Use only resistor type spark plugs of
the approved range
Correct the problems that have caused
fouling of the spark plug:
–
too much oil in fuel mix,
–
dirty air filter,
–
unfavorable running conditions, e.g.
operating at part throttle.
Spark Arresting Screen in
Muffler
Spark Plug
000BA039 KN
A