Instruction Manual
Table Of Contents
- STIHL FS 55
- 1 Guide to Using this Manual
- 2 Safety Precautions and Working Techniques
- 2.1 Clothing and equipment
- 2.2 Transporting the machine
- 2.3 Refueling
- 2.4 Before starting
- 2.5 Starting the engine
- 2.6 Holding and guiding the machine
- 2.7 While working
- 2.8 Using mowing heads
- 2.9 When using metal cutting attachments
- 2.10 Vibrations
- 2.11 Maintenance and Repairs
- 2.12 Symbols on Deflectors
- 2.13 Shoulder strap
- 2.14 Mowing Head with Nylon Line
- 2.15 STIHL Polycut Mowing Head with Polymer Blades
- 2.16 Risk of Kickout (Blade Thrust) with Metal Cutting Attachments
- 2.17 Grass Cutting Blade
- 3 Approved Combinations of Cutting Attachment, Deflector, Handle and Harness
- 4 Mounting the Bike Handle
- 5 Mounting the Loop Handle
- 6 Fitting the Carrying Ring
- 7 Mounting the Deflector
- 8 Mounting the Cutting Attachment
- 9 Fuel
- 10 Fueling
- 11 Fitting the Harness
- 12 Balancing the Machine
- 13 Starting / Stopping the Engine
- 14 Transporting the Unit
- 15 Operating Instructions
- 16 Cleaning the Air Filter
- 17 Adjusting the Carburetor
- 18 Spark Plug
- 19 Engine Running Behavior
- 20 Storing the Machine
- 21 Sharpening Metal Cutting Blades
- 22 Maintaining the Mowing Head
- 23 Inspections and Maintenance by Dealer
- 24 Maintenance and Care
- 25 Minimize Wear and Avoid Damage
- 26 Main Parts
- 27 Specifications
- 28 Maintenance and Repairs
- 29 Disposal
- 30 EC Declaration of Conformity
17.1 Adjusting Idle Speed
L
0000-GXX-8512-A0
► Start and warm up the engine.
17.1.1 Engine stops while idling
► Turn the idle speed screw (LA) slowly clock‐
wise until the engine runs smoothly – the cut‐
ting attachment must not rotate.
17.1.2 Cutting attachment rotates when
engine is idling
► Turn the idle speed screw (LA) counterclock‐
wise until the cutting attachment stops moving
and then turn the screw another 1/2 to 1 full
turn in the same direction.
WARNING
If the cutting attachment continues to rotate
when the engine is idling, have your machine
checked and repaired by your servicing dealer.
18 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".
18.1 Removing the Spark Plug
► Move the stop switch to
0.
1
232BA081 KN
► Pull off the spark plug boot (1).
► Unscrew the spark plug.
18.2 Checking the Spark Plug
000BA039 KN
A
► 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.
1
000BA045 KN
English 18 Spark Plug
26 0458-233-0121-H