Stihl FS 235 R Instruction Manual page 20

English
Condition
Engine stops while
idling
18.2 Replacing the Air Filter
The air filter cannot be cleaned. The air filter
must be replaced if there is a loss of engine or
the air filter is damaged.
► Shut off the engine.
► Move the choke lever to position
2
1
1
► Take out the screws (1) and remove the filter
cover (2).
► Clean the area around the air filter (3) with a
damp cloth or a soft brush.
► Take out the air filter (3).
3
► Install the new air filter (3).
► Fit the filter cover (2).
► Insert and tighten down the screws (1) firmly.
18.3 Standard Setting
► Shut off the engine.
H
► Turn the high speed screw (H) counterclock‐
wise as far as stop.
20
Cause
Carburetor is iced up. ► Allow trimmer to warm up to +10°C.
.
3
2
L
Remedy
► Turn the low speed screw (L) clockwise as far
as stop.
► Turn the low speed screw (L) 3/4 of a turn
counterclockwise.
18.4 Adjusting Idle Speed
► Carry out the standard setting.
► Start the engine.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
Engine stops while idling
► Turn the idle speed screw (LA) clockwise until
the cutting attachment begins to rotate.
► Turn the idle speed screw (LA) one full turn
counterclockwise.
Erratic idling behavior or poor acceleration
► Turn the low speed screw (L) clockwise or
counterclockwise until the engine runs and
accelerates smoothly.
Cutting attachment rotates when engine is idling
1
► Turn the idle speed screw (LA) counterclock‐
wise until the cutting attachment stops rotat‐
ing.
► Turn the idle speed screw (LA) one full turn
counterclockwise.
18.5 Clearing the Combustion
Chamber
► Pull off the spark plug boot (1).
► Unscrew the spark plug (2).
18 Troubleshooting
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2
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0458-500-0121-B