Technical Information · issue 52 of 2000
New Model FS 250 Brushcutters
IssueTI 52/2000
Full text
Page 1 of 6
Technical Information
52.2000
New Model FS 250 Brushcutters – Series 4134
Contents
1. Technical Description
2. Specifications
3. Cutting Tools
4. Accessories
5. Service Accessories
6. Repairs
7. Spare Parts
The new STIHL FS 250 brushcutter is the latest The descriptions in the following chapters
model in the professional line of trimmers and only refer to differences over models FS 120
brushcutters. The engine is a further development and FS 200.
of the FS 200 unit and features a larger
displacement, higher torque and a power output of
2.2 HP (1.6 kW).
Typical applications are the same as those for
models FS 120 and FS 200.
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)m~ge 2 Technical Information 52.2000
1. Technical Description
Engine
. Larger displacement – higher torque
2. Specifications
2.1 Powerhead
2.1.1 Engine
Single cylinder two cycle engine
Displacement: 2.45 cu.in (40.2 cm3)
Bore: 1.57 in (40 mm)
Stroke: 1.26 in (32 mm)
Engine power to 2.2 HP (1.6 kW)
ISO 8893: at 9,000 RPM
Engine speeds: see 2.1.2
Rewind starter: Single pawl system
Starter rope: 0.12 in (3 mm) dia.,
31.5 in (800 mm) long
Clutch:
- engages at: 4,300 RPM
2.1.2 Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump
Idle speed screw LD (standard setting) Open 2 full turns (see 6.1)
Idle speed 2,500 to 3,100 RPM
Cutoff speed range without cutting tool (electronic speed
governor) 11,300 to 13,300 RPM
Fuel tank capacity: 21.6 fl.oz (0.64 L)
Fuel mix: Mid-grade (89 octane) unleaded gasoline and two cycle engine oil
Mix ratio: 50:1 with STIHL 50:1 two cycle engine oil
2.1.3 Ignition System
Ignition module: with integral electronic speed
governor
Spark plug Bosch WSR 6F,
(suppressed): NGK BPMR 7 A or
Champion RCJ 6Y
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Technical Information 52.2000 Page 3
2.2 Gearbox
Gear ratio: 1:1.4
2.3 Weight
without cutting tool and deflector
FS 250: 13.4 lbs
(6.1 kg)
FS 250 R: 13 lbs
(5.9 kg)
3. Cutting Tools
The following cutting tools are approved
1 2
1 STIHL SuperCut 20-2 4002 710 2184
2 STIHL AutoCut 25-2 4002 710 2191
3 STIHL AutoCut 30-2 4002 710 2187
4 STIHL TrimCut 30-2 4002 710 2193
5 STIHL PolyCut 20-3 4002 710 2189
3 4
6 Grass cutting blade 230-4* 4001 713 3801
7 Grass cutting blade 230-8* 4001 713 3803
8 Brush knife 250-3* 4112 713 4100
9 Circular saw blade 200 4112 713 4201
(scratcher tooth)**
10 Circular saw blade 200 4112 713 4203 5 6
(chisel tooth)**
* Not approved for
loop handle FS 250
without barrier bar 7 8
** Approved only for
FS 250 with bike handle
9 10
250TI029 KN
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4. Accessories
4.1 General
Part Name Part No. Application
Transport guard for 4116 790 3900 Grass cutting blade 230-4, 230-8,
metal cutting tools brush knife 250-3, circular saw blade 200
4119 790 3906 Grass cutting blade 230-4, 230-8,
brush knife 250-3
4119 790 3901 Circular saw blade 200
ElastoStart 0000 190 3400 Rewind starter (grip with rope)
Starter rope 0000 195 8200 Rewind starter
STIHL gear lubricant for Drive shafts in tube
hedge 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” (2.4 mm)/ orange SuperCut 20-2, AutoCut 25-2, AutoCut 30-2, TrimCut 30-2, PolyCut 20-3
0.106” (2.7 mm)/ red PolyCut 20-3
5. Service Accessories
5.1 Special Servicing Tools
Special servicing tools are listed in the service manual for FS 120, 200, 350, 450.
5.2 Servicing Aids
Part Name Part No. Application
Carburetor parts kit 4134 007 1060 Zama C1Q S51B
Set of gaskets 4134 007 1050 Engine
Dirko sealant 0783 830 2120 Engine pan/cylinder sealing faces
Electrician’s repair kit 5910 007 1050 Electrical system
Set of screws 5910 007 1060 Screw assemblies
Standard commercial solvent- Cleaning crankshaft stub
based degreasant containing no
chlorinated or hydrogenated
hydrocarbons
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Technical Information 52.2000 Page 5
6. Repairs
If the unit is started up in the course of repairs, it is essential to strictly observe all country-specific
safety regulations and the safety precautions outlined in the owner’s manual.
6.1 Carburetor Adjustment
Standard setting
. Mount approved cutting tool
. Check air filter and replace if necessary
. Carefully screw down the idle speed screw (LD)
counterclockwise (left-hand thread) until it is
against its seat, then open it two full turns
clockwise
+
LD -
Adjusting idle speed
250TI011 KN
. Carry out standard setting
. Start and warm up the engine
Engine stops while idling:
. Turn the idle speed screw (LD) slowly clockwise until engine runs smoothly - the cutting tool must not rotate.
Cutting tool rotates while engine is idling:
. Turn the idle speed screw (LD) counterclockwise until the cutting tool stops rotating and then turn the screw
about another full turn in the same direction (counterclockwise).
Erratic idling behavior, poor acceleration:
. Turn the idle speed screw (LD) slowly counterclockwise no more than 1/2 turn.
6.2 Tightening Torques
The tightening torques for the FS 250 are listed in the service manual for models FS 120, 200, 350, 450.
6.3 Service Note
Service manual FS 120, 200, 350, 450 is available for servicing the FS 250.
This service manual does 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 250
performed by trained personnel in a properly
equipped service workshop. 1 Crankcase, Crankshaft, 2.0
Crankshaft Bearings
The repair times are given in tenths of an hour
(0.1 = 6 minutes).
3 Crankcase Gasket/Sealing 2.0
Note: This table for the FS 250 can be added to the
4 Crankshaft Seals (includes 1.0
STIHL repair times table.
pressure & vacuum testing)
5 Cylinder and/or Piston 1.0
6 Ignition Module 0.5
7 Fuel Hose 0.5
7. Spare Parts 8 Replace Gear Box/Arbor Assy. 0.5
The new unit will be integrated in the existing 9 Repair/Rebuild Carburetor 0.8
illustrated parts list for models FS 120 and 200. 10 Replace Carburetor, Carburetor 0.4
Jet (if tried to repair use code 9)
11 Front Handle, Throttle Control, 0.6
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 7108
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