Stihl 85 Manual

							
50 English / USAFS 80, FS 80 R, FS 85, FS 85 R
Definitions
1. Fuel PumpProvides additional fuel feed for a 
cold start.
2. Choke Lever Eases engine starting by enriching 
mixture.
3. Carburetor Adjusting Screws For tuning the carburetor.
4. Starter Grip The grip of the pull starter, which is 
the device to start the engine.
5. Fuel Filler Cap For closing the fuel tank.
6. Fuel Tank  For fuel and oil mixture.
7. Muffler (with spark arresting screen)
Reduces exhaust noises and 
diverts exhaust gases away from 
operator.
8. Throttle Trigger Controls the speed of the engine.
9. Slide Control For starting throttle, run and stop. 
Keeps the throttle partially open 
during starting, switches the 
engine’s ignition off to stop the 
engine. 10. Throttle Trigger Interlock 
Must be depressed before the 
throttle trigger can be activated.
11. Bike Handle  For easy control of the machine with 
both hands during cutting work.
12. Handle Support  Connects the drive tube and bike 
handle.
13. Throttle Cable Retainer Secures the throttle cable to the 
drive tube.
14. Clamp (carrying ring) Connects the brushcutter to the 
harness.
15. Spark Plug Boot Connects the spark plug to the 
ignition lead.
16. Air Filter Cover Encloses and protects the air filter. 
17. Machine Support  For resting machine on the ground.
18. Barrier Bar  
Helps maintain clearance between 
cutting tool and feet and legs of 
operator.
19. Loop Handle  For easy control of machine during 
cutting work.
20. Drive Tube  Encloses and protects drive shaft 
between engine and gearhead. 1 
Mowing head
2  Deflector 
(for mowing heads only)
3  Line limiting blade
4  Deflector with skirt 
(for all cutting tools)
5  Skirt
6  Metal mowing tool
002BA114 KN
1
3
4 5
3
6 4
1 2 
						

							
51
FS 80, FS 80 R, FS 85, FS 85 R English / USA
Definitions
1. Mowing head
The cutting attachment, i. e. mowing 
head, for different purposes 
(special accessory).
2. Deflector The deflector is designed to reduce 
the risk of injury from foreign objects 
flung backwards toward the 
operator by the cutting tool and from 
contact with the cutting tool.
3. Line limiting blade Metal blade at the deflector in order 
to keep the line of the mowing head 
at the proper length.
4. Deflector with skirt The deflector is designed to reduce 
the risk of injury from foreign objects 
flung backwards toward the 
operator by the cutting tool and from 
contact with the cutting tool. Is not 
designed to contain fragmented 
metal blades.
5. Skirt The skirt at the bottom of the 
deflector must be adjusted as 
described in the chapters on 
mounting the various cutting tools.
6. Metal mowing tool The cutting attachment, i. e. blade, 
made from metal for different 
purposes (special accessory). 7 
Circular Saw Blade
8  Limit Stop (for circular saw blade 
only)
Definitions
7. Circular Saw Blade 
Cutting tool made of metal for 
cutting wood.
8. Limit Stop  Is designed to position the 
brushcutter steady against the 
wood in order to reduce the risk of 
injury from loss of control from 
reactive forces such as thrust out.
Engine
EPA:
The Emission Compliance Period 
referred to on the Emissions 
Compliance Label indicates the number 
of operating hours for which the engine 
has been shown to meet Federal 
emission requirements. 
Category A = 300 hours, B = 125 hours, 
C = 50 hours
CARB:
The Emission Compliance Period used 
on the CARB Air Index Label indicates 
the terms:
Extended = 300 hours 
Intermediate = 125 hours 
Moderate = 50 hours
002BA186 KN
8
7
Single cylinder two-stroke engine
Displacement: 1.55 cu.in 
(25.4cm3)
Bore: 1.34 in (34 mm)
Stroke: 1.10 in (28 mm)
Power according to 
ISO 8893: 1.3 bhp  (0.95 kW)
Idle speed: 2,800 rpm
Engine cutoff speed 
(nominal): 10,500 rpm
Specifications 
						

							
52 English / USAFS 80, FS 80 R, FS 85, FS 85 R
Ignition System 
Fuel System Rewind Starter 
Weight 
1)Version with loop handle2)Version with bike handle Contact your STIHL dealer for 
information regarding special 
accessories that may be available for 
your product.
Max. speed of 
output shaft (cutting 
tool mounting) 7,500 rpm
Type: Electronic magneto ignition
Spark plug 
(suppressed): Bosch WSR 6 F,
NGK BPMR 7 A
or Champion 
RCJ 6Y
Electrode gap: 0.02 in (0.5 mm)
Spark plug thread: M 14 x 1.25; 0.37 in (9.5 mm) 
long 
Carburetor: All position diaphragm 
carburetor with integral fuel pump
Air filter: Foam and felt  elements
Fuel tank capacity: 0.93 US.pt (0.44 l)
Fuel mix: See “Fuel” Starter rope: 
0.11 in (2.7 mm) dia. x 
35.8 in (910 mm) long
without cutting tool and deflector
FS 80 R 
1)  10.8 lb (4.9 kg)
FS 80 2)  11.5 lb (5.2 kg)
FS 85 R 1)  11.0 lb (5.0 kg)
FS 85 2)  11.7 lb (5.3 kg)
FS 85 RX 1)  10.6 lb (4.8 kg)
Special Accessories 
						

							
53
FS 80, FS 80 R, FS 85, FS 85 R English / USA
Users of this unit should carry out only 
the maintenance operations described 
in this manual. Other repair work may be 
performed only by authorized STIHL 
service shops.
Warranty claims following repairs can be 
accepted only if the repair has been 
performed by an authorized STIHL 
servicing dealer using original STIHL 
replacement parts.
Original STlHL parts can be identified by 
the STlHL part number, the 
STIHl 
logo and, in some cases, by the STlHL 
parts symbol  (. This symbol may 
appear alone on small parts.
Maintenance and Repairs  
						

							
54 English / USAFS 80, FS 80 R, FS 85, FS 85 R
Your Warranty Rights and 
Obligations 
The U.S. Environmental Protection 
Agency (EPA) and STIHL Incorporated 
are pleased to explain the Emission 
Control System Warranty on your equip-
ment type engine. In the U.S. new 1997 
and later model year small off-road 
equipment engines must be designed, 
built and equipped, at the time of sale, to 
meet the U.S. EPA regulations for small 
non road engines. The equipment 
engine must be free from defects in 
materials and workmanship which 
cause it to fail to conform with U.S. EPA 
standards for the first two years of 
engine use from the date of sale to the 
ultimate purchaser.
STIHL Incorporated must warrant the 
emission control system on your small 
off-road engine for the period of time 
listed below provided there has been no 
abuse, neglect or improper maintenance 
of your small off-road equipment engine.
Your emission control system includes 
parts such as the carburetor and the 
ignition system. Also included may be 
hoses, and connectors and other 
emission related assemblies.
Where a warrantable condition exists, 
STIHL Incorporated will repair your 
small off-road equipment engine at no 
cost to you, including diagnosis (if the 
diagnostic work is performed at an 
authorized dealer), parts, and labor.
Manufacturers Warranty 
Coverage:
In the U.S., 1997 and later model year 
small off-road equipment engines are 
warranted for two years. If any emission-
related part on your engine is defective, 
the part will be repaired or replaced by 
STIHL Incorporated free of charge.
Owners Warranty 
Responsibilities:
As the small off-road equipment engine 
owner, you are responsible for the 
performance of the required mainte-
nance listed in your owners manual. 
STIHL Incorporated recommends that 
you retain all receipts covering 
maintenance on your small off-road 
equipment engine, but STIHL 
Incorporated cannot deny warranty 
solely for the lack of receipts or for your 
failure to ensure the performance of all 
scheduled maintenance.
Any replacement part or service that is 
equivalent in performance and durability 
may be used in non-warranty 
maintenance or repairs, and shall not 
reduce the warranty obligations of the 
engine manufacturer.
As the small off-road equipment engine 
owner, you should be aware, however, 
that STIHL Incorporated may deny you 
warranty coverage if your small off-road 
equipment engine or a part has failed 
due to abuse, neglect, improper mainte-
nance or unapproved modifications.You are responsible for presenting your 
small off-road equipment engine to a 
STIHL service center as soon as a 
problem exists. The warranty repairs will 
be completed in a reasonable amount of 
time, not to exceed 30 days.
If you have any questions regarding your 
warranty rights and responsibilities, 
please contact a STIHL customer 
service representative at 1-800-467-
8445 or you can write to 
STIHL Inc.,
536 Viking Drive, P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the 
ultimate purchaser and each subse-
quent purchaser that your small off-road 
equipment engine will be designed, built 
and equipped, at the time of sale, to 
meet all applicable regulations. STIHL 
Incorporated also warrants to the initial 
purchaser and each subsequent 
purchaser that your engine is free from 
defects in materials and workmanship 
which cause the engine to fail to conform 
with applicable regulations for a period 
of two years.
Warranty Period
The warranty period will begin on the 
date the utility equipment engine is 
purchased by the initial purchaser and 
you have signed and sent back the 
warranty card to STIHL.
Not for California: 
STIHL Incorporated Federal Emission Control Warranty 
Statement 
						

							
55
FS 80, FS 80 R, FS 85, FS 85 R English / USA
If any emission related part on your 
engine is defective, the part will be 
replaced by STIHL Incorporated at no 
cost to the owner. Any warranted part 
which is not scheduled for replacement 
as required maintenance, or which is 
scheduled only for regular inspection to 
the effect of repair or replace as 
necessary will be warranted for the 
warranty period. Any warranted part 
which is scheduled for replacement as 
required maintenance will be warranted 
for the period of time up to the first 
scheduled replacement point for that 
part.
Diagnosis
You, as the owner, shall not be charged 
for diagnostic labor which leads to the 
determination that a warranted part is 
defective. However, if you claim 
warranty for a component and the 
machine is tested as non-defective, 
STIHL Incorporated will charge you for 
the cost of the emission test. Mechanical 
diagnostic work will be performed at an 
authorized STIHL servicing dealer. 
Emission test may be performed either 
at STIHL Incorporated or at any 
independent test laboratory. 
Warranty Work
STIHL Incorporated shall remedy 
warranty defects at any authorized 
STIHL servicing dealer or warranty 
station. Any such work shall be free of 
charge to the owner if it is determined 
that a warranted part is defective. Any manufacturer-approved or 
equivalent replacement part may be 
used for any warranty maintenance or 
repairs on emission-related parts and 
must be provided without charge to the 
owner. STIHL Incorporated is liable for 
damages to other engine components 
caused by the failure of a warranted part 
still under warranty.
The following list specifically defines the 
emission-related warranted parts: 
Carburetor
Choke (Cold start enrichment system)
Intake manifold
Air filter 
Spark plug
Magneto or electronic ignition system 
(ignition module)
Catalytic converter (if applicable)
Fasteners
Where to make a claim for 
Warranty Service 
Bring the product to any authorized 
STIHL servicing dealer and present the 
signed warranty card. 
Maintenance Requirements
The maintenance instructions in this 
manual are based on the application of 
the recommended 2-stroke fuel-oil 
mixture (see also instruction Fuel). 
Deviations from this recommendation 
regarding quality and mixing ratio of fuel 
and oil may require shorter maintenance 
intervals.
Limitations
This Emission Control Systems 
Warranty shall not cover any of the 
following:
:
repair or replacement required 
because of misuse, neglect or lack 
of required maintenance, 
: repairs improperly performed or 
replacements not conforming to 
STIHL Incorporated specifications 
that adversely affect performance 
and/or durability, and alterations or 
modifications not recommended or 
approved in writing by STIHL 
Incorporated, 
and
: replacement of parts and other 
services and adjustments 
necessary for required maintenance 
at and after the first scheduled 
replacement point. 
						

							
56 English / USAFS 80, FS 80 R, FS 85, FS 85 R
Your Warranty Rights and 
Obligations
The California Air Resources Board 
(CARB) and STIHL Incorporated are 
pleased to explain the emissions control 
systems warranty on your 2007 and 
later small off-road equipment engine. 
In California, new equipment that uses 
small off-road-engines must be 
designed, built, and equipped to meet 
the States stringent anti-smog 
standards.  STIHL Incorporated must 
warrant the emissions control system on 
your small off-road  engine for the period 
listed below provided there has been no 
abuse, neglect or improper maintenance 
of your small off-road engine.
Your emissions control system may 
include parts such as: 
Air filter, Carburetor, Purger, Choke 
(Cold Start Enrichment System), Control 
Linkages, Intake Manifold, Magneto or 
Electronic Ignition System (Ignition 
module), Spark Plug, Catalytic 
Converter (if applicable), Fuel Tank, Fuel 
Cap, Fuel Line, Fuel Line Fittings, 
Clamps, Fasteners. 
Where a warrantable condition exists, 
STIHL Incorporated will repair your 
small off-road  equipment  engine at no 
cost to you including diagnosis, parts 
and labor.
Manufacturer’s Warranty 
Coverage
:
This emissions control system is 
warranted for two years in California. If 
any emissions-related part on your 
equipment is defective, the part will be 
repaired or replaced by STIHL 
Incorporated free of charge.
Owner’s Warranty 
Responsabilities
:
As the small off-road equipment engine 
owner, you are responsible for 
performance of the required 
maintenance listed in your instruction 
manual. STIHL Incorporated 
recommends that you retain all receipts 
covering maintenance on your small off-
road equipment engine, but STIHL 
Incorporated cannot deny warranty 
solely for the lack of receipts or your 
failure to ensure the performance of all 
scheduled maintenance.
As the small off-road equipment engine 
owner, you should however be aware 
that STIHL Incorporated may deny you 
warranty coverage if your small off-road 
equipment engine or a part has failed 
due to abuse, neglect, or improper 
maintenance or unapproved 
modifications. You are responsible for presenting your 
small off-road equipment engine to a 
STIHL servicing dealer as soon as the 
problem exists. The warranty repairs 
should be completed in a reasonable 
amount of time, not to exceed 30 days. If 
you have any questions regarding your 
warranty rights and responsibilities, 
please contact a STIHL customer 
service representative at 1-800-467-
8445 or you can write to
STIHL Inc., 536 Viking Drive,
P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the 
ultimate purchaser and each 
subsequent purchaser that your small 
off-road equipment engine is designed, 
built and equipped, at the time of sale, to 
meet all applicable emission 
regulations. 
STIHL Incorporated also warrants to the 
initial purchaser and each subsequent 
purchaser that your engine is free from 
defects in materials and workmanship 
which cause the engine to fail to conform 
to applicable emission regulations for a 
period of two years.
For California only: 
STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty 
Statement 
						

							
57
FS 80, FS 80 R, FS 85, FS 85 R English / USA
Defects Warranty Period
The warranty periods will begin on the 
date the utility equipment engine is 
purchased by the initial purchaser. If any 
emission related part on your engine is 
defective, the part will be replaced by 
STIHL Incorporated at no cost to the 
owner. 
Add on or modified parts that are not 
exempted by CARB may not be used. 
The use of any non exempted add on or 
modified parts will be grounds for 
disallowing a warranty claim. STIHL 
Incorporated will not be liable to warrant 
failures of warranted parts caused by the 
use of a non exempted add on or 
modified part.
The warranty on emissions-related parts 
will be interpreted as follows:
1. Any warranted part that is not 
scheduled for replacement as required 
maintenance in the written instructions 
required in the Emission Warranty Parts 
List (see below) must be warranted for 
the warranty period defined in 
Subsection COVERAGE BY STIHL 
INCORPORATED, see above.  If any 
such part fails during the period of 
warranty coverage, it must be repaired 
or replaced by the manufacturer 
according to Subsection (4) below.  Any 
such part repaired or replaced under the 
warranty must be warranted for the 
remaining warranty period.  
2. Any warranted part that is 
scheduled only for regular inspection in 
the written instructions required by the 
Emission Warranty Parts List (see 
below) must be warranted for the 
warranty period defined in Subsection 
COVERAGE BY STIHL 
INCORPORATED, see above. A 
statement in such written instructions to 
the effect of repair or replace as 
necessary will not reduce the period of 
warranty coverage. Any such part 
repaired or replaced under warranty 
must be warranted for the remaining 
warranty period.
3. Any warranted part that is 
scheduled for replacement as required 
maintenance in the written instructions 
required by the Emission Warranty Parts 
List (see below) must be warranted for 
the period of time prior to the first 
scheduled replacement point for that 
part.  If the part fails prior to the first 
scheduled replacement, the part must 
be repaired or replaced by the engine 
manufacturer according to Subsection 
(4) below.  Any such part repaired or 
replaced under warranty must be 
warranted for the remainder of the 
period prior to the first scheduled 
replacement point for the part.
4. Repair or replacement of any 
warranted part under the warranty must 
be performed at a warranty station at no 
charge to the owner.5. Notwithstanding the provisions of 
Subsection (4) above, warranty services 
or repairs will be provided at all 
manufacturer distribution centers that 
are authorized to service the subject 
engines.
6. The owner must not be charged for 
diagnostic labor that leads to the 
determination that a warranted part is in 
fact defective, provided that such 
diagnostic work is performed at a 
warranty station. 
Warranty Work 
STIHL Incorporated shall remedy 
warranty defects at any authorized 
STIHL servicing dealer or warranty 
station. Any such work shall be free of 
charge to the owner if it is determined 
that a warranted part is defective. Any 
manufacturer approved or equivalent 
replacement part may be used for any 
warranty maintenance or repairs on 
emission related parts and must be 
provided without charge to the owner. 
STIHL Incorporated is liable for 
damages to other engine components 
caused by the failure of a warranted part 
still under warranty.  
						

							
58 English / USAFS 80, FS 80 R, FS 85, FS 85 R
Emission Warranty Parts List
Air filter, Carburetor, Purger, Choke 
(Cold Start Enrichment System), Control 
Linkages, Intake Manifold, Magneto or 
Electronic Ignition System (Ignition 
Module), Spark Plug, Catalytic 
Converter (if applicable), Fuel Tank, Fuel 
Cap, Fuel Line, Fuel Line Fittings, 
Clamps, Fasteners
Where to make a claim for 
Warranty Service
Bring the STIHL product to any 
authorized STIHL servicing dealer and 
present the signed STIHL product 
registration card, or the print-out of the 
electronic product registration.
Limitations
The repair or replacement of any 
warranted part otherwise eligible for 
warranty coverage  may be excluded 
from such warranty coverage if STIHL 
Incorporated demonstrates that the 
STIHL product has been abused, 
neglected, or improperly maintained, 
and that such abuse, neglect, or 
improper maintenance was the direct 
cause of the need for repair or 
replacement of the part. That 
notwithstanding, any adjustment of a 
component that has a factory installed, 
and properly operating, adjustment 
limiting device is still eligible for warranty 
coverage.  
STIHL Registered Trademarks
STIHL®
q
(
The color combination orange-grey 
(U.S. Registrations #2,821,860; 
#3,010,057; and #3,010,058)
4-MIX
®
AUTOCUT®
EASYSTART®
OILOMATIC®
STIHL Cutquik®
STIHL DUROMATIC®
STIHL Farm Boss®
STIHL Quickstop®
STIHL ROLLOMATIC®
STIHL WOOD BOSS®
TIMBERSPORTS®
YARD BOSS®
Some of STIHL’s Common Law 
Trademarks
BioPlus™
Easy2Start™
EasySpool™
ElastoStart™
Ematic™ / Stihl-E-Matic™
FixCut™
HT Plus™
IntelliCarb™
Master Control Lever™
Micro™
Pro Mark™
Quad Power™
Quiet Line™
STIHL Arctic™
STIHL Compact™
STIHL HomeScaper Series™
STIHL Interchangeable Attachment 
Series™
Trademarks 
						

							
59
FS 80, FS 80 R, FS 85, FS 85 R English / USA
STIHL Magnum™ / Stihl-Magnum™
STIHL MiniBoss™
STIHL MotoPlus 4™
STIHL Multi-Cut HomeScaper Series™
Stihl Outfitters™
STIHL PICCO™
STIHL PolyCut™
STIHL PowerSweep™
STIHL Precision Series™
STIHL Protech™
STIHL RAPID™
STIHL SuperCut™
STIHL Territory™
TapAction™
TrimCut™
This listing of trademarks is subject to 
change.
Any unauthorized use of these 
trademarks without the express written 
consent of 
ANDREAS STIHL AG & Co. KG, 
Waiblingen is strictly prohibited.