Spark Arresting Screen; In Muffler; Checking The Spark Plug - Stihl MS 441 Instruction Manual

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Fine Tuning for Operation at High
Altitude
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude:
: Check the standard setting.
: Warm up the engine.
Turn the high speed screw (H) 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.
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Spark Arresting Screen

in Muffler

: If the engine is down on power,
check the spark arresting screen* in
the muffler.
: Wait for the muffler to cool down.
: Take out the screw (1).
: Remove the spark arresting
screen (2).
: Clean the spark arresting screen.
If the screen is damaged or heavily
carbonized, fit a new one.
: Refit the spark arresting screen.
: Fit the screw and tighten it down
firmly.
* see "Guide to Using this Manual"

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.
MS 441