Technical Information · issue 2 of 2000
New Model FS 83 Brushcutter
IssueTI 2/2000
Full text
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Technical Information
02.2000
New Model FS 83 Brushcutter - Series 4141
Contents
1. Technical Description
2. Specifications
3. Tools
4. Accessories
5. Service Accessories
6. Repairs
7. Spare Parts
The new low-emission STIHL FS 83 already Benefits are a reduction in unburned gases in the
complies with CARB II regulations. It uses a new exhaust and lower fuel consumption.
engine (4141 powerhead) with a stratified
The controls, drive tube and gearhead are exactly
scavenging system that reduces emission levels.
the same of the STIHL FS 85.
In this scavenging system a layer of fuel-free air is
Recommended applications are the same as for the
stacked on top of the combustible mixture. This
FS 85.
cushion of air achieves mostly fuel-free exhaust.
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1. Technical Description
Controls, handle system, drive tube and gearhead as FS 85
Engine with stratified scavenging system
380TI004 KN
Compression and induction
. Additional reed valves in the transfer ports enable a fuel-free layer of air to enter on top of the combustible
mixture
380TI005 KN
Combustion
. Pressure in crankcase rises and causes the reed valves in the transfer ports to close
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380TI006 KN
Scavenging (inlet)
. Fuel-free layer of air enters the cylinder first
380TI007 KN
Scavenging (outlet)
. Exhaust consists primarily of fuel-free air
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380TI008 KN
Induction and compression
. Reed valves in transfer ports open again
2. Specifications
2.1 Powerhead
2.1.1 Engine
Single cylinder two-
stroke engine
Displacement: 1.55 cu.in (25.4 cm3)
Bore: 1.34 in (34 mm)
Stroke: 1.10 in (28 mm)
Engine power to 1.2 HP (0.9 kW)
ISO 8893: at 7,000 RPM
Engine speeds: see 2.1.2
Rewind starter: Single pawl system
Starter rope: 0.12 in dia. x 31.5 in
(3 mm x 800 mm)
Clutch engages at: 4,100 ± 200 RPM
2.1.2 Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump
Idle speed screw LA (standard setting) Open 6 full turns
Idle speed 3,000 RPM
Cut-off speed without cutting tool: without speed governor 12,900 RPM
with speed governor 10,500 RPM
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Fuel tank capacity: 24 fl.oz (0.7 L)
Fuel mix: Branded mid grade gasoline and STIHL two-cycle engine oil
Mix ratio: 50:1 with STIHL 50:1 two-cycle engine oil
2.1.3 Ignition System
Spark plug NGK CMR 7 A
(suppressed): 0000 400 7007
Electrode gap: 0.020-0.024 in (0.5-0.6 mm)
Spark plug thread: M10x1.0
0.37in (9.5 mm) long
2.2 Weight
Without cutting tool and deflector
FS 83: 11.7 lbs
(5.3 kg)
FS 83 R: 11.2 lbs
(5.1 kg)
3. Tools
1 2
3.1 Cutting Tools
The following cutting tools are approved:
1 STIHL Supercut 20-2 4002 710 2162
2 STIHL Autocut 21-2 4002 710 2113
3 4
3 STIHL Autocut 25-2 4002 710 2108
4 STIHL Trimcut 30-2 4002 710 2122
5 STIHL Polycut 20-3 4002 710 2130
6 Grass cutting blade 230-4* 4001 713 3801
7 Grass cutting blade 230-8* 4001 713 3803 5 6
8 Brush knife 250-3* 4112 713 4100
9 Circ.saw blade 200 4112 713 4201
(scratcher tooth)**
10 Circ.saw blade 200 4112 713 4203
(chisel tooth)** 7 8
* Not approved for loop
handle FS 83 without
barrier bar
** Approved only for FS 83 9 10
380TI009 KN
with bike handle, double
shoulder harness and limit
stop
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4. Accessories
4.1 General
Part Name Part No. Application
Spark plug NGK CMR 7A 0000 400 7007 Engine
ElastoStart™ 0000 190 3400 Rewind starter (grip with rope)
Starter rope 0000 195 8200 Rewind starter, also for ElastoStart™
STIHL gear lubricant for hedge Drive shaft in tube
trimmers
- 2.8 oz (80 g) tube 0781 120 1109
- 8 oz (225 g) tube 0781 120 1110
STIHL gear lubricant for Gearhead
brushcutters
- 2.8 oz (80 g) tube 0781 120 1117
- 8 oz (225 g) tube 0781 120 1118
4.2 Nylon Line for Mowing Heads
Line diameter / color Application
0.095” / orange Supercut 20-2, Autocut 21-2, Autocut 25-2, Trimcut 30-2, Polycut 20-3
0.105” / red Polycut 20-3
5. Service Accessories
5.1 Special Servicing Tools
Special servicing tools for the powerhead are listed in the shop manuals for the series 4141 powerhead. For
all other parts see shop manual for STIHL FS 75, 80, 85.
5.2 Servicing Aids
Part Name Part No. Application
Carburetor parts kit 4141 007 1002 Walbro WYA1
Set of gaskets 4141 007 1003 Engine
Lubricating grease 0781 120 1111 Oil seals
- 8 oz (225 g) tube
Electrician’s repair kit 5910 007 1050 Electrical system
Standard commercial solvent- Cleaning crankshaft stub
based degreasant containing no
chlorinated or hydrogenated
hydrocarbons
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6. Repairs
If the unit is started up in the course of repairs or maintenance work, it is essential to strictly observe
all local and national safety regulations and the safety precautions outlined in the owner’s manual.
6.1 Carburetor Adjustment
Standard setting
. Mount the approved cutting tool.
. Check air filter and fit a new one if necessary.
. Back off the idle speed screw (LA) counter-
clockwise until the end of screw (see arrow) is
no longer visible. Rotate the screw six full turns
clockwise from that position.
Adjusting idle speed
LA
. Carry out the standard setting.
. Start and warm up the engine.
. Set the idle speed properly with the idle speed
screw (LA): Engine must not stop while idling
and should accelerate smoothly.
Engine stops while idling:
. Turn the idle speed screw (LA) slowly clockwise
until engine runs smoothly - the cutting tool must
not rotate.
Cutting tool rotates while engine is idling:
. Turn the idle speed screw (LA) counter-
380TI010 KN
clockwise until the cutting tool stops rotating.
Then turn screw about another two full turns in
the same direction (counter-clockwise).
6.2 Tightening Torques
Tightening torques for the powerhead are listed in the shop manual for the series 4141 powerhead. For all other
parts see shop manual for STIHL FS 75, 80, 85.
Important! Tighten spark plug to max. 11lbf.ft (15 Nm) with the engine cold.
6.3 Service Note
The shop manual for the STIHL series 4141 powerhead can be used for servicing and repair procedures on
the powerhead of model FS 83. For all other parts see shop manual for STIHL FS 75, 80, 85.
These shop manuals do not include the chapters "Servicing the Carburetor", "Troubleshooting" or any repairs
involving standard procedures. Such procedures are described in separate handbooks, i.e. “Carburetors” and
"Standard Repairs, Troubleshooting".
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6.4 Repair Times
The specified repair times assume that the work is Code Type of Repair FS 83
performed by trained personnel in a properly
1 Crankcase, Crankshaft, 2.0
equipped service workshop.
Crankshaft Bearings
The repair times are given in tenth of an hour 3 Crankcase Gasket/Sealing 2.0
(0.1 = 6 minutes). 4 Crankshaft Seals (includes 1.0
pressure & vacuum testing)
5 Cylinder and/or Piston 1.2
Note: This table for model FS 83 can be added to
the STIHL repair times table. 6 Ignition Module 0.5
7 Fuel Hose 0.5
8 Replace Gear Box/Arbor Assy. 0.5
9 Repair/Rebuild Carburetor 0.8
10 Replace Carburetor 0.4
7. Spare Parts (if tried to repair use code 9)
An illustrated parts list is available for the new 11 Front Handle, Throttle Control, 0.6
model. Throttle Cable
12 Recoil Starter 0.5
13 Clutch, Clutch Drum, 0.7
Clutch Drum Housing
14 Drive Tube, Drive Shaft 0.5
15 Muffler 0.4
16 Air Filter, Filter Cover, Tank Cap, 0.4
Tank Vent, Fuel Filter, Spark Plug,
Cutting Attachment,
Miscellaneous Minor Repairs
17 Stop Switch 0.5
18 Fuel Tank 0.4
19 Repair Gear Box, Gears, 0.8
Arbor Bearings
20 All Other Repairs 0.5
✂
© 2000 Andreas STIHL AG & Co. Technical Documentation
Waiblingen D1/MTK-na 6807
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Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.