Spark Arresting Screen In Muffler - Stihl FS 500 Instruction Manual

Cutting attachment rotates when
engine is idling
N Turn the idle speed screw (LA)
counterclockwise until the cutting
attachment stops moving and then
rotate the screw another 1/2 to 1
turn in the same direction.
Erratic idling behavior, poor
acceleration
Idle setting is too lean
N Carry out standard setting on low
speed screw (L).
N Turn the low speed screw (L) slowly
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA) after
every correction to the low speed
screw (L).
Fine Tuning for Operation in
Mountains or at Sea Level
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude or at sea level.
N Check the standard setting.
N
Warm up the engine.
N Adjust idle speed properly.
At high altitude
N Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
FS 500, FS 550
At sea level
N Turn high speed screw (H)
counterclockwise (richer) – no
further than stop.
If the setting is too lean there is a
risk of engine damage due to
insufficient lubrication and
overheating.
Spark Arresting Screen in
Muffler
In some countries the muffler is
equipped with a spark arresting screen.
N If the engine is down on power,
check the spark arresting screen in
the muffler.
N Wait for the muffler to cool down.
N Move the slide control to STOP-0.
N Remove the spark plug boot – see
"Removing the spark plug".
1
2
3 4
2
N Remove the mounting screws from
the shroud (1) and lift shroud away.
N Take out the self-tapping
screws (2).
N
Remove the baffle (3) and spark
arresting screen (4).
English
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