Technical Information · issue 51 of 2005
New Model FC 90 Power Edger
IssueTI 51/2005
Full text
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STIH)
Technical Information 51.2005
New Model FC 90 Power Edger – Series 4180
Contents
1. Technical Description
2. Specifications
3. Cutting Tools
4. Accessories
5. Service Accessories
6. Repairs
7. Spare Parts
The new STIHL FC 90 with 4-MIX® engine and
curved drive tube extends the range of power
edgers.
The 4-MIX® engine incorporates STIHL’s patented
system of lubrication and operates according to the
four-stroke principle. It uses the same fuel mix as
STIHL two-stroke engines.
The engine has a displacement of 1.73 cu in
(28.4 cm3) and a power output of 1.3 bhp (0.95 kW).
The range of applications is the same as for model
FC 100.
TI_51_2005_30_01_01.fm englisch / English USA
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1. Technical Description
1.1 STIHL 4-MIX® Engine 1.2 Tank Cap
The 4-MIX® engine features gas-oil lubrication.
Compared to a conventional four-stroke engine, the
4-MIX® engine has no separate oil supply in the
crankcase. Engine lubrication is provided by the fuel
mixture of gasoline and 2-cycle engine oil.
The benefits of this new concept are:
. Same familiar fuel mix as for STIHL two-stroke
engines
. Favorable fuel consumption
. Operates in all positions
. Good acceleration The tank cap is designed for quick and simple
. Compact construction – attractive design opening and closing.
. Favorable power-to-weight ratio
. Simple maintenance – service-friendly
. Automatic decompression system
2. Specifications
2.1 Powerhead
STIHL 4-MIX® engine with gas-oil lubrication
Displacement: 1.73 cu in (28.4 cm3)
Bore: 1.5 in (38 mm)
Stroke: 0.98 in (25 mm)
Engine power to ISO 8893: 1.3 bhp (0.95 kW) at 7,000 rpm
Torque: 11.5 lbf in (1.3 Nm) at 5,500 rpm
Idle speed: 2,800 rpm
Clutch
– clutch engages at: 3,700 rpm
Cut-off speed
(electronic speed governor):: 10,500 +/- 200 rpm
Max. output shaft speed
(cutting tool mounting): 8,500 +/- 160 rpm
Rewind starter: Single pawl system
Starter rope
– diameter x length: 0.120 in x 33 1/2 in (3.0 mm x 850 mm)
Valve clearance
- Inlet: 0.004 in-0.015 in (0.1 mm-0.4 mm)
- Exhaust: 0.004 in-0.015 in (0.1 mm-0.4 mm)
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Technical Information 51.2005 Page 3
2.2 Ignition System
Ignition module with integral electronic speed governor
Spark plug (resistor type): Bosch USR 7AC
Electrode gap: 0.02 in (0.5 mm)
2.3 Fuel System
The STIHL 4-MIX® engine features gasoline-oil lubrication and must be run on a fuel mixture of gasoline and
air cooled 2-cycle engine mix oil.
2.3.1 Fuel
Fuel mix: 50:1 with STIHL 2-cycle mix oil
2.3.2 Fuel Tank
Capacity: 18.0 fl oz (530 cm3)
2.3.3 Carburetor
All position diaphragm carburetor with integral fuel pump
Basic setting without limiter caps when performing repairs
Low speed screw L: Open 1 turn
High speed screw H: Open 3.5 turns
Standard setting with limiter caps
Low speed screw L: Open 3/4 turn (no further than stop)
High speed screw H: Open 3/4 turn (no further than stop)
2.4 Weight
with blade and deflector: 13.7 lbs (6.2 kg)
2.5 Gearhead
Gear ratio: 1:1.235
Lubrication: STIHL gear lubricant for brushcutters
Initial filling: 0.5 oz (15 g)
Re-lubrication: 0.2 oz (5 g)
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3. Cutting Tools
3.1 Blades
Description Length x thickness Part No.
Blader 8 in x 3/32 in 4133 713 4101
(200 x 2.4 mm)
Blade 8 in x 5/32 in 4133 713 4102 special accessory
(200 x 3.8 mm)
3.2 Aid
Description Part No. Application
STIHL balancer 5910 850 2600 Balancing the blade
4. Accessories
Description Part No. Application
Starter rope 0000 195 8203 Rewind starter
Skirt 4137 716 3200 Deflector
Deflector 4137 713 4503 Gearhead
Depth wheel 4133 712 1000 Gearhead
STIHL gear lubricant for brushcutters Gearhead
– 3 oz (80 g) tube 0781 120 1117
– 8 oz (225 g) tube 0781 120 1118
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Technical Information 51.2005 Page 5
5. Service Accessories
5.1 Special Servicing Tools
Description Part No. Application
Extension 4180 893 4400 Removing clutch drum and AV element in conjunction
with puller 5910 890 4400
Removing tool 5910 890 4602 Pressing out clutch drum
Installing tool 5910 890 2206
5910 890 2208 Installing hookless snap rings (piston boss).
Installing tool 5910 890 2208 with the latest sleeve
5910 893 1703 can be used in place of 2206.
Sleeve 5910 893 1703 Installing hookless snap rings (piston boss) ; for
retrofitting older installing tool 5910 890 2208.
Piston Stop
– previous: 4180 890 2700
– new: 4282 890 2700 Blocking the crankshaft
Existing special servicing tools are listed in the following service manuals:
Assembly Service Manual
Powerhead, control handle STIHL Series 4180 Powerhead (basic engine)
Control handle, handle, drive tube STIHL Series 4137 Components, FS 85
Gearhead and deflector STIHL KombiTools
5.2 Servicing Aids
Description Part No. Application
Valve clearance
adjusting kit 4180 007 1005 Checking, adjusting valve clearance
Set of gaskets 4180 007 1006 Engine
Carburetor parts kit 4180 007 1060 C1Q-S110
Lubricating grease,
8 oz (225 g) tube 0781 120 1111 Oil seals
Dirko HT sealant, red
3.2 oz (90 g) tube 0783 830 2000 Sealing engine pan/cylinder, cylinder/cam gear cover
Electrical repair kit 5910 007 1050 Electrical system
Set of screws 5910 007 1060
Press Fluid OH 723,
3.4 fl oz (100 ml) bottle 0781 957 9000 AV rubber elements, fuel hose connector
Standard commercial,
solvent-based degreasant
without chlorinated or
halogenated hydrocarbons Cleaning crankshaft stubs and flywheel taper
(see TI 25.2005)
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6. Repairs
If the machine is started up in the course of repairs, The engine can be tested for leaks with the
it is essential to observe all country-specific safety carburetor/crankcase tester and vacuum pump.
regulations and the safety precautions outlined in Carry out the leakage test as for model FS 110 (see
the instruction manual. TI 01.2002 or the service manual for Series 4180
Powerhead).
6.1 Checking Valve Clearance
Check and adjust valve clearance only when the 6.3 Clutch Drum
engine is cold. Use the valve clearance adjusting kit see TI 49.2005.
4180 007 1005 (consisting of feeler gauge, sealing
ring and gasket) for this purpose. 6.4 Fuel Tank, Hose
see TI 49.2005.
6.2 Leakage Test 6.5 Adjusting Throttle Cable
Leaks are caused by defective oil seals and gaskets see TI 49.2005.
or cracks in castings. Such faults may allow
supplementary air to enter the engine and change
the air-fuel-oil mixture.
This can upset the lubricating process or cause it to
fail.
6.6 Tightening Torques
The tightening torques are listed in the following service manuals:
Assembly Service Manual
Powerhead, control handle STIHL Series 4180 Powerhead (basic engine)
Control handle, handle, drive tube STIHL Series 4137 Components, FS 85
Gearhead and deflector STIHL KombiTools
6.7 Service Note
The following service manuals are available for servicing and repairing:
Assembly Service Manual
Powerhead STIHL Service Training System “Diagnosis”
Powerhead, control handle STIHL Series 4180 Powerhead (basic engine)
Control handle, handle, drive tube STIHL Series 4137 Components, FS 85
Gearhead and deflector STIHL KombiTools
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Technical Information 51.2005 Page 7
6.8 Serial Number 6.9 Repair Times
The repair times for the FC 90 are the same as for
the FC 100 power edger – see repair times table for
FC 100, 110.
The serial number is located on the side of the
engine pan as shown in the illustration.
7. Spare Parts
Spare parts documentation is already available for
the new machine.
The new machine is included in the STIHL Service
Communication System (SCS / MediaCat CD-
ROM) from issue 01/2006.
© ANRDREAS STIHL AG & Co. KG, 2005 Technical Documentation
D1/MTK-na
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