Technical Information · issue 41 of 2002
New Model FS 100 Brushcutter
Model FS tool Sound Sound power Vibration Vibration
IssueTI 41/2002
Full text
Page 1 of 21
Technical Information
41.2002
New Model FS 100 Brushcutter – Series 4180
Contents
1. Technical Description
2. Specifications
3. Cutting Tools
4. Accessories
5. Service Accessories
6. Service Note
7. Spare Parts
FS 100 R FS 100 R with barrier bar FS 100
The new STIHL FS 100 brushcutter with 4-MIX The engine has a displacement of 31.4 cm3 and a
engine is the latest addition to the semi-professional power output of 1.0 kW.
range.
The range of applications is the same as for model
The new 4-MIX engine operates with the patented FS 85 brushcutters.
STIHL lubricating system. Gas flow is controlled
according to the four-stroke principle. The STIHL
4-MIX engine uses the same fuel mixture as STIHL
two-stroke engines.
TI_41_2002_01_01_01.fm englisch / english
)m~ge 2 Technical Information 41.2002
1. Technical Description 1.1.2 Valve Timing Gear
1.1 STIHL 4-MIX Engine
The 4-MIX engine features gas-oil lubrication. 7
Compared to a conventional four-stroke engine, the
4-MIX engine has no separate oil supply in the
crankcase. Engine lubrication is effected by way the
fuel mixture of gasoline and engine oil. 1 2
The benefits of this new concept are: 6
. Familiar fuel mix 5
. Favorable fuel consumption
. Operates in all positions 4
. Reduced emissions
. Good acceleration
. Compact construction – attractive design 3
254TI011 KN
. Favorable power-to-weight ratio
. Simple maintenance – service-friendly
. More pleasant engine note – lower noise level
. fo
Overhead valves (OHV), one inlet valve (1) and
one exhaust valve (2)
. Lower vibrations . Valve timing via gear (3), cam (4), cam
. Reduced cranking effort follower (5), pushrod (6) and rocker arm (7)
. Cross-flow scavenging
1.1.1 Engine Construction (= inlet and exhaust sides opposite one another)
Single cylinder engine with overhead valves.
Cylinder head, cylinder and the upper half of the
crankcase form a single block.
The crankcase is split horizontally along the
crankshaft centerline.
254BA016 KN
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Technical Information 41.2002 Page 3
1.2 Tank Cap
The new tank cap with a hinged clip is designed for
quick and simple opening and closing.
1.2.1 Opening 1.2.2 Closing
254TI020 KN
254TI022 KN
. Swing the clip up to the vertical position. . Place the cap in position with the clip vertical –
the marks must line up.
.
Rotate the cap about 1/4 turn clockwise.
n 254TI021 KN
254TI023 KN
. Rotate the cap about 1/4 turn counterclockwise.
. Remove the tank cap.
. Fold the clip down so that it is level with the top
edge of the cap.
The tank cap is properly locked in position when the
clip’s lug engages the recess (see arrow in right
illustration).
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)m~ge 4 Technical Information 41.2002
1.3 Engine Lubrication
The lubricating process takes place in two phases
during one revolution of the crankshaft.
Phase 1 Phase 2
Piston moves in direction of top dead center. Piston moves in direction of bottom dead center.
5 fo
254TI019 KN
254TI017 KN
The increase in volume in the crankcase creates a Over-pressure is created by the reduction in volume
depression. Gasoline-oil-air mixture is sucked in in the crankcase.
from the inlet port (1) and flows via the bypass This causes the gasoline-oil-air mixture in the
bore (2), valve gear (3) and timing gear (4) to the crankcase to be forced back through the timing
crankcase (5). The oil in the mixture lubricates the gear, valve gear and the bypass bore to the inlet
crankgear, timing gear, valve gear and the cylinder port. All lubricating points are wetted again in this
wall. process.
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Technical Information 41.2002 Page 5
2. Specifications
2.1 Powerhead 2.3 Fuel System
STIHL single cylinder four-stroke engine with The STIHL 4-MIX engine features gasoline-oil
gas-oil lubrication lubrication and must be run on a fuel mixture of
Displacement: 31.4 cm3 gasoline and engine oil.
Bore: 40 mm Fuel mix:
Stroke: 25 mm Brand-name regular grade gasoline (leaded or
Engine power to 1 kW at unleaded) and branded two-stroke engine oil.
ISO 8893: 7,000 rpm
Idle speed: 2,800 rpm Mix ratio:
Rewind starter: Single pawl system 50:1 with STIHL 50:1 two-stroke engine oil
Starter rope: 3 mm diameter, 25:1 with other branded two-stroke engine oils
850 mm long
Carburetor:
Clutch engages at: 3,700 rpm All position diaphragm carburetor with integral fuel
Valve clearance pump
Inlet: 0.10 mm
Exhaust: 0.10 mm
Low speed screw L
2.2 Ignition System fo
(standard setting with
caps): Open max. 3/4 turn
Ignition module: with integral electronic (as far as stop)
speed governor
(Standard setting without
Spark plug NGK CMR 5 H caps): Open 1 3/4 turns
(suppressed): Bosch USR 7AC
High speed screw H
Electrode gap: 0.7 mm (standard setting with
caps): Max. 3/4 turn
(as far as stop)
(Standard setting without
caps): Open 2 turns
Cut-off speed without tool
(electronic speed
governor): 10,500 +/- 500 rpm
Fuel tank capacity: 530 cm3
2.4 Gearhead
Gear ratio: 1:1.4
2.5 Weight
without cutting tool and
deflector
FS 100: 5.6 kg
FS 100 R: 5.4 kg
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)m~ge 6 Technical Information 41.2002
2.6 Noise and Vibration Data
Model FS tool Sound Sound power Vibration Vibration
or pressure level measurement measurement
attachments level Lpeq Lweq to ISO 7916 to ISO 7916
Idling Max. RPM
to to (m/s2) (m/s2)
ISO 7919 1) ISO 10884 1) Handle Handle
dB(A) dB(A) left right left right
2)
FS 100 Mowing head 90 101 2.4 2.1 5.3 4.2
FS 100 2) Metal tool 89 100 2.5 2.4 5.8 3.8
FS 100 R 3) Mowing head 88 101 2.9 2.2 8.2 8.5
4)
FS 100 R Metal tool 89 100 3.2 2.2 5.4 8.2
FS 100 2) Attachment 89 ... 90 99 ... 101 2.2 ... 3.1 2.0 ... 3.4 3.7 ... 6.6 3.2 ... 4.3
3)
FS 100 R Attachment 89 ... 91 99 ... 101 2.4 ... 4.1 1.5 ... 2.9 3.5 ... 6.0 6.0 ... 7.6
1)
2)
Weighted equivalent level includes idling and racing with the same duration of exposure
Bike-handled version
3)
Loop-handled version
4)
Loop-handled version with barrier bar
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Technical Information 41.2002 Page 7
3. Cutting Tools
The following cutting tools are approved
1 STIHL Supercut 20-2
mowing head 4002 710 2162 1 2
2 STIHL Autocut 21-2
mowing head 4002 710 2113
3 STIHL Autocut 25-2
mowing head 4002 710 2108
4 STIHL Trimcut 30-2 3 4
mowing head 4002 710 2122
5 STIHL Polycut 20-3
mowing head 4002 710 2130
5
6 Grass cutting blade 230-2 1) 4001 713 3805
7 Grass cutting blade 230-4 1) 4001 713 3801
8 Grass cutting blade 230-8 1) 4001 713 3803
9 Brush knife 250-3 1) 4112 713 4100
10 Circular saw blade 200 4112 713 4201 6 7
(scratcher tooth) 2)
11 Circular saw blade 200
(chisel tool) 2)
4112 713 4203 fo
8 9
1) Not approved for loop-handled FS 100
without barrier bar
2) Not approved for FS 100
with loop handle
10 11
393TI006 KN
All the cutting tools listed above must be used with
the recommended deflector and/or barrier bar
(see catalog "Cutting Attachments").
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)m~ge 8 Technical Information 41.2002
4. Accessories
General
Part Name Part No. Application
Transport guard for 4116 790 3901 Grass cutting blade 230-2, 230-4, 230-8,
metal cutting tools brush knife 250-3, circular saw blade 200
4119 790 3906 Grass cutting blade 230-2, 230-4, 230-8,
brush knife 250-3
4119 790 3901 Circular saw blade 200
Starter rope 0000 195 8203 Rewind starter
STIHL gear lubricant for Gearbox
brushcutters
- 80 g tube 0781 120 1117
- 225 g tube 0781 120 1118
STIHL special oil Rewind spring in starter,
100 ml bottle
Nylon line for mowing head
0781 417 1315 fo
bearing bore in rope rotor
Diameter / color Application
2.4 mm / orange SuperCut 20-2, AutoCut 25-2, AutoCut 30-2, TrimCut 30-2, PolyCut 20-3
2.7 mm / red PolyCut 20-3
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Technical Information 41.2002 Page 9
5. Service Accessories
5.1 Special Servicing Tools
Required for model FS 100
Part Name Part No. Application
Compression pressure tester 5910 850 2000 Checking compression pressure
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 Installing hookless snap rings (piston boss)
Sleeve 5910 893 1703 Installing hookless snap rings (piston boss) in
conjunction with installing tool 5910 890 2208
Feeler gauge 4180 893 6400 Checking, adjusting valve clearance
Stop screw 4180 890 2700 Blocking the crankshaft
Existing special servicing tools are listed in the service manual for the STIHL series 4180 powerhead (basic
engine).
5.2 Servicing Aids
Part Name 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 Carburetor
Lubricating grease (225 g tube) 0781 120 1111 Oil seals
Dirko sealant 0783 830 2120 Sealing engine pan/cylinder, cylinder/cam gear
cover
Standard commercial, solvent- Cleaning the crankshaft stub
based degreasant without
chlorinated or halogenated
hydrocarbons
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)m~ge 10 Technical Information 41.2002
6. Service Note
If the machine is started up in the course of repairs,
it is essential to observe all country-specific safety
regulations and the safety precautions outlined in 6
the instruction manual.
6.1 Checking Valve Clearance
5
The valve clearance must be checked once after
about 135 hours of operation and adjusted if 4
254TI002 KN
necessary. 4
Check and adjust valve clearance only when the
engine is cold. Use the valve clearance adjusting kit
4180 007 1005 (consisting of feeler gauge, sealing . Take out the screws (4).
ring and gasket) for this purpose. . Remove the shroud (5).
. Pull off the spark plug boot (6).
6.1.1 Preparations
. Clean the area around the spark plug.
It is easier to move the piston to top center on the
ignition stroke when the rewind starter is removed. . Unscrew the spark plug.
However, it is also possible to turn the crankshaft
with the starter with the starter cover mounted.
7
3
8
1 1
2
9
254TI001 KN
. Push the slide control in direction of c (arrow)
to STOP–$
$.
. Take out the screws (1). 10
254TI003 KN
. Remove the starter cover (2) from the housing.
. Take out the screw (3).
. Clean area around the valve cover.
. Take out the screw (7).
. Remove the sealing ring (8), valve cover (9) and
gasket (10).
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Technical Information 41.2002 Page 11
6.1.2 Top Dead Center
Top dead center (T.D.C.) is the point at which the
movement of the piston changes from upwards to
downwards. In the 4-MIX engine the power stroke
takes place once every two revolutions of the
crankshaft. As a result, the piston passes through
top dead center twice but performs only one power
stroke. See STIHL Service Training System
"Carburetor", four-stroke principle.
Top Dead Center, Valve Overlap Top Dead Center, Ignition
2
2
3 3
1 1
-n 254TI010 KN
254TI009 KN
Cam (1) points up. Cam (1) points down.
The rocker arms (2) and valve stems (3) move up The rocker arms (2) and valve stems (3) do not
and down (see top arrows) when the crankshaft is move up and down when the crankshaft is turned
turned back and forth a few degrees. back and forth a few degrees.
This is the change in stroke between exhaust and This is the change in stroke between compression
induction. and power.
Valve clearance must be adjusted at top dead
center on the ignition stroke. It is only in the
position that inlet and exhaust valves are closed at
the same time.
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)m~ge 12 Technical Information 41.2002
6.1.3 Determining Top Dead Center 6.1.4 Checking Valve Clearance
The cam gear cover must be removed to check and
adjust valve clearance.
2
1 2
1
3
254TI008 KN
. Rotate the crankshaft until the arrow (1) is in line
with the right-hand screw head (2) on the
ignition coil.
2
The piston is now at top dead center, either on valve
overlap or ignition.
254TI005 KN
1
. Insert the feeler gauge (1) between the rocker
arm (2) and valve stem (3). The feeler gauge
must move with slight resistance.
Readjust valve clearance if the check shows it to be
excessive or insufficient.
6.2 Adjusting Valve Clearance
254TI004 KN
. Turn the crankshaft back and forth a few
degrees – if the rocker arms und valve stems
(see arrows) move up and down, the piston is at 2
top dead center on valve overlap.
. Rotate the crankshaft one more revolution until
the arrow again lines up with the right-hand
screw head on the ignition coil.
254TI006 KN
If the rocker arms and valve stems do not move, the
1
piston is at top dead center on the ignition stroke.
. Turn the crankshaft back about 1/4 revolution . Insert the feeler gauge (1) between the rocker
counterclockwise and then turn it slowly arm and valve stem.
clockwise until the arrow is in line with the right-
hand screw head. Depending on current clearance
. Turn nut (2) clockwise clockwise to reduce valve
It is necessary to turn the crankshaft back to clearance or counterclockwise to increase valve
eliminate play in the timing gear. clearance – the feeler gauge must slide back
and forth with slight resistance.
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Technical Information 41.2002 Page 13
. Rotate crankshaft two revolutions until the 6.4 Checking Compression Pressure
arrow again lines up with the right-hand screw . Pull the boot off the spark plug and then
head on the ignition coil. unscrew the spark plug.
. Check valve clearance again and readjust if
necessary.
6.3 Assembling
Use sealing ring and gasket supplied in the valve 1
clearance adjusting kit 4180 007 1005.
249TI013 KN
1
. Screw compression pressure tester
5910 850 2000 (1) into the spark plug hole.
254TI007 KN
. Move slide control to STOP–$
$
.
foSet choke to e
. Place the gasket (1) on the sealing face and . Pull the starter rope several times – firmly and
make sure it is properly positioned (see arrows). quickly as for a normal start.
. Fit the valve cover and tighten down the screw . Note compression pressure reading –
to 3.5 Nm. it should be 6 – 7 bar
. Install spark plug, shroud and spark plug boot. If pressure is less than 6 bar:
. Fit the starter cover and tighten down the . Check valve clearance, readjust if necessary
screws firmly. and check compression pressure again.
. Start the engine and allow it to warm up. If pressure is still less than 6 bar:
. Shut off the engine. . Inspect cylinder, valve seat, piston and rings for
. Check engine for leaks. scores and damage.
6.5 Carburetor
The carburetor comes from the factory with a
standard setting.
This setting provides an optimum fuel-air mixture
under most operating conditions.
With this carburetor it is only possible to correct the
adjustment of the high speed and low speed screws
within fine limits.
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)m~ge 14 Technical Information 41.2002
6.5.1 Construction 6.5.3 Servicing / Repairs
2
5
1
2
249TI005 KN
249TI002 KN
6 3 4
. Low speed screw (1) The caps have to be removed to replace a damaged
adjusting screw or clean the carburetor.
. Limiter cap (2) for low speed screw
. High speed screw (3) . Push the puller 5910 890 4501 (1), with the
groove facing you, between the limiter cap (2)
. Limiter cap (4) for high speed screw and carburetor body and pry off the cap.
. Stop (5) . If the limiter cap is stuck on the adjusting screw,
. Idle speed screw (6) with cap fo
turn the puller over so that its groove faces the
carburetor body and then pry off the limiter cap.
The caps are pushed over the heads of the Do not re-install used caps.
adjusting screws and on to the knurling. The stop (5)
on the carburetor body limit screw rotation.
Adjustment after servicing / repairs
. Check the air filter and clean or replace as
6.5.2 Function necessary.
. Check spark arresting screen (where
applicable) and clean or replace as necessary.
Standard setting
270° 270°
H L
249TI004 KN
The caps limit the range of adjustment of the high
speed and low speed screws to 270 degrees (3/4
249TI006 KN
turn).
. Starting with the adjusting screws against their
seats:
Open H screw 2 full turns
Open L screw 1 3/4 turns
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Technical Information 41.2002 Page 15
Installing the caps Adjusting idle speed
H L
H L
249TI009 KN
249TI007 KN
LA
Do not re-install used caps . Use idle speed screw (LA) to set engine speed
to 2,800 rpm.
. Fit the new limiter caps in position so that they
butt against the rich stop (see arrow). This adjustment must be checked with a tachometer
– note that there is an ignition spark on every
revolution of the 4-MIX engine.
a
.
Checking running behavior
Open the throttle several times to check that the
engine accelerates properly and runs smoothly
at idle speed.
Engine idles erratically
. Turn the low speed screw (L) clockwise (no
249TI008 KN
further than stop) until the engine runs smoothly
and acceleration is still good.
. Push on the caps until dimension
6.5.4 Setting instructions for users
"a" is 5 mm
The user may adjust the screws only within a range
of 270 degrees.
This enables the carburetor setting to be tuned to
changes in operating conditions. For example:
– Different altitude (mountains – sea level)
– Change of cutting tool
(mowing head – metal cutting blade)
The procedure for setting the carburetor is
described in the owner’s manuals (see chapter
"Adjusting the Carburetor").
TI_41_2002_01_01_01.fm
)m~ge 16 Technical Information 41.2002
6.5.5 Accelerator Pump 6.6 Leakage Test
Defective oil seals and gaskets or cracks in castings
cause leaks. Such faults allow supplementary air to
4 enter the engine and change the gasoline-oil-air
mixture.
This can upset the lubricating process or cause it to
fail altogether.
2 a
1 3 The engine can be checked for leaks with the
carburetor and crankcase tester and the vacuum
9 pump.
8
249TI010 KN
7
6
5
6.6.1 Preparations
. Move the slide control to STOP–$
$
The carburetor is equipped with an accelerator
pump. The pump piston (6) is located in the bore (a) . Remove the shroud.
behind the throttle shaft (4) and is held in the idle . Remove the filter cover and air filter.
position by a compression spring (8).
. Remove the filter housing and pull off the
Strainer (5) is installed in bore (a) in front of the gasket.
throttle shaft (4) to prevent the ingress of dirt.
. To release tank pressure, open the tank cap and
Disassembling the accelerator pump
then close it again.
. Disconnect the fuel hoses and the impulse hose
. Take out the screw (1). from the carburetor.
. Remove the throttle shutter (2). . Disconnect the throttle cable.
. Remove the E-clip (3). . Pull off the carburetor.
. Take out the strainer (5).
1
. Hold the bore (a) closed with one finger.
. Push back the throttle shaft with lever (4) until 2
the end of the throttle shaft is visible in the
venturi. 3
. Carefully expose the bore (a) – then remove
the pump piston (6) with sealing ring (7) and
spring (8). 5 4
249TI014 KN
. Take out the strainer (9) and replace if it is dirty
or damaged.
. Inspect the pump piston (6) and spring (8) –
. Push the test flange (1) 1119 850 4201 into
replace if damaged.
position.
. Fit a new sealing ring (7) in the groove of the
. Fit the sleeves (2) 0000 963 1008 and nuts (3)
pump piston (6).
and tighten down firmly.
. Reassemble in the reverse sequence.
. Use a suitable plug (5) to seal the impulse
hose (4).
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Technical Information 41.2002 Page 17
6.6.3 Vacuum Test
Oil seals tend to fail when subjected to a vacuum,
i.e. the sealing lip lifts away from the crankshaft
1
during the piston's induction stroke because there is
no internal counterpressure.
249TI015 KN
. Loosen the muffler mounting screws.
249TI016 KN
. Insert the sealing plate (1) 0000 855 8106
between the exhaust gasket and the muffler –
the sealing plate must completely cover the
muffler opening. . Connect suction hose (arrow) of vacuum pump
. Tighten down the screws. 0000 850 3501 to nipple of test flange.
. Continue with "Pressure Test".
.
.
Close the vent screw on the pump.
Operate vacuum pump until the pressure gauge
6.6.2 Pressure Test indicates a vacuum of 0.5 bar.
. If the vacuum reading remains constant, or does
not drop to less than 0.3 bar within 20 seconds,
it can be assumed that the oil seals are in good
condition.
. If the pressure continues to rise (reduced
vacuum in the crankcase), the oil seals must be
replaced.
249TI016 KN
. Connect pressure hose of tester 1106 850 2905
to nipple on test flange (arrow).
. Close the vent screw on the rubber bulb.
. Pump air into the engine housing with rubber
bulb until the gauge indicates a pressure of 0.5
bar. If this pressure remains constant for at least
20 seconds, the engine housing is airtight.
. If the pressure drops, the leak must be found
and the faulty part replaced.
. To find the leak, coat the suspect area with oil
and pressurize the engine housing again.
Bubbles will appear if a leak exists.
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)m~ge 18 Technical Information 41.2002
6.7 Antivibration System 6.8 Clutch Drum
. Remove the fan housing. . Remove the fan housing.
1 2
1
249TI020 KN
249TI018 KN
. Take out the screw (1). . Remove the circlip (1).
. Remove sleeves (2) with rubber mount.
249TI021 KN
249TI019 KN
. Support the ball bearing at the clutch drum side
with removing tool (2) 5910 890 4602.
. Insert extension (2) 4180 893 4400 in clutch
drum’s square hole. . Turn over the removing tool with fan housing –
fan housing rests on the removing tool.
. Apply puller (3) 5910 890 4400 with No. 2 jaws
and clamp the puller arms – jaws must engage
in recesses of clamp.
. Pull clamp with rubber element out of the fan
housing. 3
249TI022 KN
. Insert extension (3) 4180 893 4400 in the
square hole and press the clutch drum out of the
bearing seat.
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Technical Information 41.2002 Page 19
Testing the ignition system
5 To test the ignition system, use either the ZAT 4
ignition system tester 5910 850 4503 or the ZAT 3
ignition system tester 5910 850 4520.
The ignition test refers only to the spark test.
A new ignition module must be installed if no ignition
spark is obtained even though the wiring and stop
switch are in good condition.
249TI023 KN
Ignition timing
4
The ignition module accommodates all the
components required to control ignition timing.
. Take out the screw (4).
gnition timing is permanently set according the
. Use a suitable arbor to press the ball bearing (5) design specification and cannot be adjusted during
out of its seat. servicing work.
. Press home the new ball bearing with press There is an ignition spark on every revolution of the
arbor 4119 893 7200. crankshaft.
. Tighten the screw (4) to 4 Nm.
. Reassemble in the reverse sequence.
6.9 Ignition System
1
2
3
249TI024 KN
There are three electrical connections on the coil
body:
. High voltage output with ignition lead (1)
. Connector tag (2) for ground wire
. Connector tag (3) for short circuit wire
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)m~ge 20 Technical Information 41.2002
6.10 Adjusting the Throttle Cable
After mounting the bike handle it is necessary to
preset the throttle cable on the control handle using
the integrated throttle cable adjuster. STO
254TI014 KN
1
. Squeeze the interlock lever and throttle trigger
254TI012 KN
all the way (full throttle) – this sets the throttle
cable correctly – the slide moves away from the
bottom of the slot.
. Check that the slide below the trigger interlock
lever is at the bottom of the slot (arrow).
254TI015 KN
254TI013 KN
If the slide is not at the bottom of the slot:
. Use a screwdriver to push the slide to the
bottom of the slot.
TI_41_2002_01_01_01.fm
)qechnic~l=fnform~tion=QNKOMMO========================================================================m~ge=ON
6.11 Tightening Torques .
Tightening torques for the FS 100 are listed in the Repair procedure FS 100
service manual for the STIHL series 4180
powerhead (basic engine). 1 Remove and refit engine 10
2 Crankcase, pressure test* 100
6.12 Service Note 3 Crankshaft, bearings, 100
For servicing and repair procedures on the FS 100 pressure test*
refer to the service manual for the STIHL series 4 Sealing rings, pressure test* -
4180 powerhead; see also STIHL Service Training 5 Crankcase leakage test, test run 40
System "Diagnosis". 6 Cylinder, piston, pressure test* -
7 Ignition system, contact* 15
6.13 Repair Times
8 Fuel supply, tank vent, 10
The specified repair times assume that the work is test run
performed by trained personnel in a properly 9 Manifold or flange, -
equipped service workshop.
pressure test
The repair times are given in minutes. 10 Carburetor, check* 30
This table for the FS 100 can be added to the STIHL 11 Handle and throttle control 10
repair times table. 12 Rewind starter, test run 15
13 Clutch, test run 20
7. Spare Parts 14
15
fo Muffler
Air filter
10
5
A separate illustrated parts list is available for the
16 Stop switch, test run 10
new model.
17 Clutch housing -
18 Drive tube 20
19 Replace gearhead or bearing 5
housing
20 Limit stop or deflector 10
21 Drive shaft 10
22 Fuel tank 15
23 Check compression pressure 5
24 Adjust valve clearance 10
25 Replace crankcase, 150
bottom half
26 Replace crankshaft 160
27 Replace cylinder, piston 180
28 Oil supply -
29 Oil pump, test run -
✂
* Test run under load
© 2002 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-bl 7648
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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.