Stihl MS 271 Notice D'emploi page 33

28 Spark Plug
1
► Undo screw (1)
► Pull out the spark arresting screen (2)
► Clean the dirty spark arresting screen, replace
if damaged or heavily carbonized
► Refit the spark arresting screen
► Insert the screw
► If the muffler plugs are missing or damaged,
mount new plugs
28 Spark Plug
► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
28.1 Removing the spark plug
► Remove the shroud – see "Shroud".
► Move the Master Control lever to the stop
position (0).
► Pull off the spark plug boot.
► Clean away loose dirt from around the spark
plug.
0458-574-8221-D
2
► Insert the combination wrench through the
grommet (1) and turn it as necessary to
engage the spark plug's hexagon.
► Push the combination fully home against the
cylinder.
► Unscrew the spark plug.
28.2 Checking the Spark Plug
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
English
1
A
1
33