This document provides specifications and service information for STIHL chainsaw models 021, 023, and 025. It includes details on the engine, fuel system, ignition system, clutch, chain drive components, and other parts. Safety precautions are outlined, noting that gasoline is extremely flammable and proper disposal of waste oil is required. Repair and maintenance work should only be performed according to local regulations and with the engine off unless otherwise specified.
This document provides specifications and service information for STIHL chainsaw models 021, 023, and 025. It includes details on the engine, fuel system, ignition system, clutch, chain drive components, and other parts. Safety precautions are outlined, noting that gasoline is extremely flammable and proper disposal of waste oil is required. Repair and maintenance work should only be performed according to local regulations and with the engine off unless otherwise specified.
Stihl km 55 kombi motor service repair manualfujjfdjjskkfemm
This document provides specifications and troubleshooting information for STIHL components 4140 FC, FS, HL, KM from 2003-2010. It covers topics such as fuel system specifications, gearbox types, tightening torques, and troubleshooting issues with the clutch, rewind starter, fuel system, and engine. Procedures for servicing components like the carburetor, rewind starter, throttle control, and fuel system are also described. The document aims to aid repair shops in servicing and repairing these STIHL machines.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
Stihl ms 460 c chainsaw service repair manualufjjskekmem
This document provides specifications and repair procedures for the STIHL MS 460 chainsaw from 2004-2011. It includes specifications on the engine, fuel system, ignition system, and other components. The document also provides detailed instructions for troubleshooting, disassembling, repairing, and reassembling the various systems and components of the chainsaw. Tightening torques are specified for fasteners. Symbols are defined that are used in the text and illustrations.
The document provides specifications and troubleshooting information for STIHL chain saw models MS 311 and MS 391. It contains sections on the engine, fuel system, ignition system, clutch, chain brake, and other components. Troubleshooting tables list potential causes and remedies for issues like the saw chain stopping under load or loud noises from the clutch. The document also provides specifications for items like engine power, clutch engagement speed, and tightening torques.
Stihl fs 55 trimmer service repair manualufjjjskekemme
This document provides service information for STIHL models FS 45, 46, 55, FC 55, HL 45, and KM 55 powerheads. It covers specifications, safety precautions, troubleshooting, and repair procedures for engine components such as the rewind starter, throttle control, fuel system, and drive tube. Detailed instructions are given for removing, installing, and servicing parts, along with required tools and torque specifications for fasteners.
Stihl ms 440 chainsaw service repair manualufjjsjkfkemme
This document provides specifications and troubleshooting information for servicing the STIHL MS 440 chainsaw. It details specifications for the engine, fuel system, ignition system, and other components. The document then covers troubleshooting for various systems like the clutch, rewind starter, chain lubrication, ignition system, and carburetor. Subsequent sections provide instructions for servicing components such as the cylinder, piston, crankcase, ignition system, rewind starter, fuel system, and other parts.
Stihl ms 192 t chainsaw service repair manualfujjdjjkskemme
This document provides specifications and troubleshooting information for the STIHL MS 192 T chainsaw. It includes specifications for the engine, fuel system, ignition system, and chain lubrication system. The document also lists typical tightening torques for various fasteners. Additionally, it provides potential causes and remedies for common problems with the clutch, chain drive, chain brake, chain tensioner, chain lubrication, rewind starter, ignition system, carburetor, and engine.
This document provides specifications and service information for STIHL chainsaw models 021, 023, and 025. It includes details on the engine, fuel system, ignition system, clutch, chain drive components, and other parts. Safety precautions are outlined, noting that gasoline is extremely flammable and proper disposal of waste oil is required. Repair and maintenance work should only be performed according to local regulations and with the engine off unless otherwise specified.
Stihl km 55 kombi motor service repair manualfujjfdjjskkfemm
This document provides specifications and troubleshooting information for STIHL components 4140 FC, FS, HL, KM from 2003-2010. It covers topics such as fuel system specifications, gearbox types, tightening torques, and troubleshooting issues with the clutch, rewind starter, fuel system, and engine. Procedures for servicing components like the carburetor, rewind starter, throttle control, and fuel system are also described. The document aims to aid repair shops in servicing and repairing these STIHL machines.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
Stihl ms 460 c chainsaw service repair manualufjjskekmem
This document provides specifications and repair procedures for the STIHL MS 460 chainsaw from 2004-2011. It includes specifications on the engine, fuel system, ignition system, and other components. The document also provides detailed instructions for troubleshooting, disassembling, repairing, and reassembling the various systems and components of the chainsaw. Tightening torques are specified for fasteners. Symbols are defined that are used in the text and illustrations.
The document provides specifications and troubleshooting information for STIHL chain saw models MS 311 and MS 391. It contains sections on the engine, fuel system, ignition system, clutch, chain brake, and other components. Troubleshooting tables list potential causes and remedies for issues like the saw chain stopping under load or loud noises from the clutch. The document also provides specifications for items like engine power, clutch engagement speed, and tightening torques.
Stihl fs 55 trimmer service repair manualufjjjskekemme
This document provides service information for STIHL models FS 45, 46, 55, FC 55, HL 45, and KM 55 powerheads. It covers specifications, safety precautions, troubleshooting, and repair procedures for engine components such as the rewind starter, throttle control, fuel system, and drive tube. Detailed instructions are given for removing, installing, and servicing parts, along with required tools and torque specifications for fasteners.
Stihl ms 440 chainsaw service repair manualufjjsjkfkemme
This document provides specifications and troubleshooting information for servicing the STIHL MS 440 chainsaw. It details specifications for the engine, fuel system, ignition system, and other components. The document then covers troubleshooting for various systems like the clutch, rewind starter, chain lubrication, ignition system, and carburetor. Subsequent sections provide instructions for servicing components such as the cylinder, piston, crankcase, ignition system, rewind starter, fuel system, and other parts.
Stihl ms 192 t chainsaw service repair manualfujjdjjkskemme
This document provides specifications and troubleshooting information for the STIHL MS 192 T chainsaw. It includes specifications for the engine, fuel system, ignition system, and chain lubrication system. The document also lists typical tightening torques for various fasteners. Additionally, it provides potential causes and remedies for common problems with the clutch, chain drive, chain brake, chain tensioner, chain lubrication, rewind starter, ignition system, carburetor, and engine.
Stihl 021 chainsaw service repair manualkfdjkskdmm
This document provides specifications and repair instructions for Stihl chainsaw models 021, 023, and 025. It details the engine, fuel system, ignition system, cutting attachment, and other components. The document also provides repair instructions for the clutch, chain drive, chain brake, and other assemblies. Tightening torques for fasteners are specified.
This document provides specifications and repair instructions for STIHL 017 and 018 chainsaws. It includes sections on the engine, fuel system, ignition system, clutch, chain drive components, and other systems. The document contains detailed diagrams and steps for disassembling and servicing various parts of the saws. Tightening torques are provided for different fasteners. Special tools needed for some repair procedures are also listed.
This document provides specifications and repair instructions for STIHL chain saw models 017 and 018 from 2000-2006. It includes sections on the engine, fuel system, ignition system, clutch, chain drive, and other components. The document provides detailed steps for disassembling and assembling parts like the chain brake, rewind starter, carburetor, and more. Tightening torques and special tools required are also listed.
Stihl 017 chainsaw service repair manualfjsjekkdmmemm
This document provides specifications and repair instructions for STIHL chain saw models 017 and 018 from 2000-2006. It includes sections on the engine, fuel system, ignition system, clutch, chain drive, and other components. Detailed steps are provided for disassembling and assembling parts like the chain brake, rewind starter, carburetor, and more. Tightening torques and special tools required for repairs are also listed.
This document provides specifications and repair instructions for STIHL 017 and 018 chainsaws. It includes sections on the engine, fuel system, ignition system, clutch, chain drive components, and other systems. The document contains detailed diagrams and steps for disassembling and servicing various parts of the chainsaws. Tightening torques are provided for different fasteners. Special tools needed for some repair procedures are also listed.
Stihl 018 chainsaw service repair manualufjjjskekemme
This document provides specifications and repair instructions for STIHL chain saw models 017 and 018 from 2000-2006. It includes sections on the engine, fuel system, ignition system, clutch, chain drive, and other components. The document provides detailed steps for disassembling and assembling parts like the chain brake, rewind starter, carburetor, and more. Tightening torques and special tools required are also listed.
Stihl ms 250 chainsaw service repair manualfjjsfkskemem
Adjust air gap to specified
setting
Faulty ignition module Replace ignition module
Faulty ignition coil Replace ignition coil
Engine does not start Spark plug wet with fuel Clean spark plug and dry
thoroughly
Spark plug electrode gap too
wide or too narrow
Adjust electrode gap to specified
setting
Spark plug faulty Replace spark plug
Ignition lead damaged Replace ignition lead
Ignition module faulty Replace ignition module
Ignition coil faulty Replace ignition coil
Fuel tank vent blocked Clean tank vent
Stihl ms 230 chainsaw service repair manual service repair manualufjjdfjkskemfmme
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for testing, removing, and installing parts, with torque specifications for fasteners. The document also outlines safety precautions that should be followed when working on or starting the engines.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
Stihl ms 211 chainsaw service repair manualfjsekksmefm
This document provides service and repair information for STIHL chain saw models MS 171, MS 181, and MS 211. It covers specifications, troubleshooting, and repair procedures for the engine, ignition system, fuel system, clutch, chain brake, rewind starter, and other components. The manual aims to help repair shops properly service these chain saws by providing detailed technical information.
Stihl ms 181 chainsaw service repair manualfjsekksem
This document provides specifications and service information for STIHL chain saw models MS 171, 181, and 211. It includes sections on engine specifications, fuel system, ignition system, chain lubrication system, tightening torques for components, and troubleshooting guides for various systems. The document aims to aid technicians in repairing and servicing these chain saw models.
Stihl ms 171 chainsaw service repair manualfsejfksekmmd
This document provides service and repair information for STIHL chain saw models MS 171, MS 181, and MS 211. It covers specifications, troubleshooting, and repair procedures for the engine, ignition system, fuel system, clutch, chain brake, rewind starter, and other components. The manual aims to help repair shops properly service these chain saws by providing detailed technical information.
This document provides specifications and service instructions for STIHL MS 171, 181, and 211 chainsaws. It covers topics such as engine specifications, fuel and ignition systems, chain lubrication, and troubleshooting various components. Detailed instructions are given for servicing the clutch, chain brake, engine, ignition system, rewind starter, and other parts. Tightening torques and the use of special servicing tools are also discussed.
Kohler command cv25 vertical crankshaft engine service repair manualufjjdjjkskemme
This document is a service manual for a vertical crankshaft engine. It contains sections covering safety information, tools needed for service, troubleshooting, maintenance of various engine systems, disassembly, inspection, and reassembly. Safety is the primary focus of Section 1, outlining important precautions regarding rotating parts, hot parts, accidental starting, harmful exhaust gases, spring tension, explosive gases, electrical shock, flammable fuels and cleaning solvents. It also provides information on engine identification numbers and recommended oils and fuels.
Kohler command cv20 vertical crankshaft engine service repair manualufjjdjjkskemme
This document is a service manual for a vertical crankshaft engine. It contains 12 sections covering safety information, specifications, troubleshooting, maintenance and repair procedures for the engine's various systems. Section 1 provides important safety warnings and precautions for working on the engine. It identifies rotating parts, hot parts, accidental starts and other hazards. The engine identification numbers and their meanings are also explained in Section 1.
Kohler command ch15 horizontal crankshaft service repair manualufjjdjjkskemme
This service manual provides information for servicing a horizontal crankshaft engine. It contains 11 sections covering safety, tools, troubleshooting, air and fuel systems, lubrication, the starter, electrical components, disassembly, inspection, reassembly, and specifications. The specifications section lists power, torque, dimensions, weight, oil capacity, lubrication type, angle of operation, balance shaft details, and other technical specifications for the engine models.
Kawasaki kbl34 a trimmer brushcutter service repair manualufjjdjjkskemme
This document provides information for servicing trimmer/brushcutter engines produced by Kawasaki Heavy Industries, including model numbers and manuals. It begins with copyright information and warnings against reproducing content without permission. The document then lists common abbreviations used and provides emission control information requiring tampering with emission systems to be prohibited.
Kawasaki kbh26 a trimmer brushcutter service repair manualufjjdjjkskemme
This document provides information for servicing trimmer/brushcutter engines produced by Kawasaki Heavy Industries, including model numbers and manuals. It begins with copyright information and warnings against reproducing content without permission. The document then lists common abbreviations used and provides emission control information specific to maintaining compliance.
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Stihl 021 chainsaw service repair manualkfdjkskdmm
This document provides specifications and repair instructions for Stihl chainsaw models 021, 023, and 025. It details the engine, fuel system, ignition system, cutting attachment, and other components. The document also provides repair instructions for the clutch, chain drive, chain brake, and other assemblies. Tightening torques for fasteners are specified.
This document provides specifications and repair instructions for STIHL 017 and 018 chainsaws. It includes sections on the engine, fuel system, ignition system, clutch, chain drive components, and other systems. The document contains detailed diagrams and steps for disassembling and servicing various parts of the saws. Tightening torques are provided for different fasteners. Special tools needed for some repair procedures are also listed.
This document provides specifications and repair instructions for STIHL chain saw models 017 and 018 from 2000-2006. It includes sections on the engine, fuel system, ignition system, clutch, chain drive, and other components. The document provides detailed steps for disassembling and assembling parts like the chain brake, rewind starter, carburetor, and more. Tightening torques and special tools required are also listed.
Stihl 017 chainsaw service repair manualfjsjekkdmmemm
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This document provides specifications and repair instructions for STIHL 017 and 018 chainsaws. It includes sections on the engine, fuel system, ignition system, clutch, chain drive components, and other systems. The document contains detailed diagrams and steps for disassembling and servicing various parts of the chainsaws. Tightening torques are provided for different fasteners. Special tools needed for some repair procedures are also listed.
Stihl 018 chainsaw service repair manualufjjjskekemme
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Stihl ms 250 chainsaw service repair manualfjjsfkskemem
Adjust air gap to specified
setting
Faulty ignition module Replace ignition module
Faulty ignition coil Replace ignition coil
Engine does not start Spark plug wet with fuel Clean spark plug and dry
thoroughly
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Stihl ms 230 chainsaw service repair manual service repair manualufjjdfjkskemfmme
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for testing, removing, and installing parts, with torque specifications for fasteners. The document also outlines safety precautions that should be followed when working on or starting the engines.
This document provides service and repair information for Stihl MS 210, 230, and 250 chainsaws. It includes specifications, troubleshooting charts, and repair procedures for the clutch, chain drive, engine, ignition system, fuel system, and other components. Detailed instructions are provided for tasks like testing for leaks, replacing gaskets and seals, adjusting the carburetor, and servicing the rewind starter, chain lubrication system, and other parts. Tightening torques and the use of special tools are also specified.
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This document provides specifications and service information for STIHL chain saw models MS 171, 181, and 211. It includes sections on engine specifications, fuel system, ignition system, chain lubrication system, tightening torques for components, and troubleshooting guides for various systems. The document aims to aid technicians in repairing and servicing these chain saw models.
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This document provides service and repair information for STIHL chain saw models MS 171, MS 181, and MS 211. It covers specifications, troubleshooting, and repair procedures for the engine, ignition system, fuel system, clutch, chain brake, rewind starter, and other components. The manual aims to help repair shops properly service these chain saws by providing detailed technical information.
This document provides specifications and service instructions for STIHL MS 171, 181, and 211 chainsaws. It covers topics such as engine specifications, fuel and ignition systems, chain lubrication, and troubleshooting various components. Detailed instructions are given for servicing the clutch, chain brake, engine, ignition system, rewind starter, and other parts. Tightening torques and the use of special servicing tools are also discussed.
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Understanding Catalytic Converter Theft:
What is a Catalytic Converter?: Learn about the function of catalytic converters in vehicles and why they are targeted by thieves.
Why are They Stolen?: Discover the valuable metals inside catalytic converters (such as platinum, palladium, and rhodium) that make them attractive to criminals.
Steps to Prevent Catalytic Converter Theft:
Parking Strategies: Tips on where and how to park your vehicle to reduce the risk of theft, such as parking in well-lit areas or secure garages.
Protective Devices: Overview of various anti-theft devices available, including catalytic converter locks, shields, and alarms.
Etching and Marking: The benefits of etching your vehicle’s VIN on the catalytic converter or using a catalytic converter marking kit to make it traceable and less appealing to thieves.
Surveillance and Monitoring: Recommendations for using security cameras and motion-sensor lights to deter thieves.
Statistics and Insights:
Theft Rates by Borough: Analysis of data to determine which borough in NYC experiences the highest rate of catalytic converter thefts.
Recent Trends: Current trends and patterns in catalytic converter thefts to help you stay aware of emerging hotspots and tactics used by thieves.
Benefits of This Presentation:
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2. Onlineversion
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This service manual contains
detailed descriptions of all the
repair and servicing procedures
specific to this power tool series.
There are separate handbooks for
servicing procedures for
standardized parts and
assemblies that are installed in
several STIHL power tool models.
Reference is made to these
handbooks in the appropriate
chapters in this manual.
As the design concept of model
021, 023 and 025 chainsaws is
almost identical, the descriptions
and servicing procedures in this
manual generally apply to all
three models. Differences are
described in detail.
You should make use of the
illustrated parts lists while carrying
out repair work. They show the
installed positions of the individual
components and assemblies.
Refer to the latest edition of the
relevant parts list to check the part
numbers of any replacement parts
needed.
Parts lists on microfiche and
CD-ROM are always more up to
date than printed lists.
A fault on the machine may have
several causes. To help locate the
fault, consult the troubleshooting
charts for all assemblies in the
"Standard Repairs, Troubleshoo-
ting" handbook.
Refer to the "Technical Informa-
tion" bulletins for engineering
changes which have been intro-
duced since publication of this
service manual. Technical informa-
tion bulletins also supplement the
parts list until a revised edition is
issued.
The special servicing tools mentio-
ned in the descriptions are
listed in the last chapter of this
manual.
Use the part numbers to identify
the tools in the "STIHL Special
Tools" manual.
The manual lists all special
servicing tools currently available
from STIHL.
Symbols are included in the text
and pictures for greater clarity.
The meanings are as follows:
In the descriptions:
• = Action to be taken as
shown in the illustration
(above the text)
- = Action to be taken that
is not shown in the
illustration
(above the text)
In the illustrations:
= Pointer
= Direction of movement
Service manuals and all technical
information bulletins describing
engineering changes are intended
exclusively for the use of STIHL
servicing dealers. They must not
be passed to third parties.
Servicing and repairs are made
considerably easier if the clamp
(1) 5910 890 2000 is used to
mount the machine on assembly
stand (2) 5910 890 3100 so that
one clamp screw engages the
outer 10 mm bore (3) in the
assembly stand.
To service the underside of the
machine (e.g. remove the oil
pump), turn the machine through
180 degrees and mount it so that
one clamp screw engages the
inner 10 mm bore (1) in the
assembly stand.
Note: Pull the hand guard back
against the front handle for this
purpose.
The powerhead can then be
swivelled to the best position for
the ongoing repair and this leaves
both hands free.
Always use original STIHL
replacement parts.
They can be identified by the
STIHL part number,
the STIHL logo
and the
STIHL parts symbol (
The symbol may appear alone on
small parts.
2. INTRODUCTION
VA135RA019
1
2 021, 023, 025
3. Onlineversion
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3.1 Engine
STIHL single cylinder two-stroke engine with special impregnated cylinder bore
021 023 L 023 025
Displacement: 35.2 cm3
40.2 cm3
40.2 cm3
45.4 cm3
2.15 cu.in 2.45 cu.in 2.45 cu.in 1.8 cu.in
Bore: 40 mm 40 mm 40 mm 42 m 42,5 mm
1.57 in 1.57 in 1.57 in 1.7 in
Stroke: 28 mm 32 mm 32 mm 32 mm 32 mm
1.10 in 1.26 in 1.26 in 1.26 in
Power output to ISO 7293: 1.5 kW (2.0 bhp) 1.1 kW (1.5 bhp) 1.9 kW (2.6 bhp) 2.2 kW (3.0 bhp)
at 9,000 rpm at 6,500 rpm at 9,500 rpm at 10,000 rpm
Max. permissible engine speed
(with bar and chain): 11,500 rpm 1)
12,500 rpm 13,000 rpm
Idle speed: 2,800 rpm
Bearings: Crankshaft supported in heavy-duty ball bearings, needle cages on
small and big ends
Cylindrical rollers on big end 2)
Piston pin diameter: 10 mm (0.39 in)
Rewind starter: Pawl engagement
Pawls: Single pawl system
Reserve pull on rope rotor: min. 1/2 turn
Starter rope: 3.0 mm (0.12 in) dia.
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,600 rpm 4,100 rpm 3,500 rpm 3,500 rpm
Crankcase leakage
test
at gauge pressure: 0.5 bar (7.25 psi)
under vacuum: 0.5 bar (7.25 psi)
3.2 Fuel System
Carburetor: Diaphragm carburetor
Standard setting on carburetors
with three adjusting screws
High speed screw H: Open approx. 1 turn
Low speed screw L: Open approx. 1 turn
Carburetor leakage test
at gauge pressure: 0.8 bar (11.6 psi)
Function of tank vent
at gauge pressure: ≤ 0.3 bar (4.35 psi)
under vacuum: ≤ 0.05 bar (0.725 psi)
Fuel tank capacity: 0.47 l (1 US pt)
Octane rating: min. 90 RON (US/CAN; pump octane min. 87)
Fuel mixture: Regular brand name gasoline
and two-stroke engine oil
Mix ratio: 50:1 with STIHL two-stroke engine oil
25:1 with other brand name two-stroke, air-cooled engine oils
Air filter:Box filter, fabric or fleece filter
1)
Not adjustable
2)
021 only up to serial number X 34 944 402
3. SPECIFICATIONS
021, 023, 025 3
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3.3 Ignition System Type: Electronic magneto
ignition (breakerless)
with integral trigger unit
Air gap: 0.2 - 0.4 mm (0.008 - 0.016 in)
Spark plug (suppressed): Bosch WSR 6F,
NGK BPMR 7 A,
Champion RCJ 6Y or
Autolite 2984
Electrode gap: 0.5 mm (0.020 in)
3.4 Cutting Attachment Chain lubrication: Fully automatic speed-controlled
oil pump with rotary piston
Oil deivery rate: approx. 7.5 cm3
/min (0.25 fl.oz/min)
at 10,000 rpm
Oil tank capacity: 0.20 l (0.4 US pt)
3.5 Special Accessories
3.5.1 For User STIHL repair kit 1123 900 5000
3/8" P, 8-tooth rim sprocket kit 1123 007 1001
.325", 7-tooth rim sprocket kit 1123 007 1003
.325", 8-tooth rim sprocket kit 1123 007 1002
1/4", 8-tooth spur sprocket 1123 640 2010
3/8" P, 7-tooth spur sprocket 1123 640 2000
.325", 7-tooth spur sprocket 1123 640 2015
.325", 8-tooth spur sprocket 1123 640 2020
Side chain tensioner kit 1123 007 1000
3.5.2 For Service Carburetor parts kit 1123 007 1061
4 021, 023, 025
5. Onlineversion
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DG screws are used in the polymer and light-alloy components. These screws form a permanent thread
when they are installed for the first time. They can be removed and installed as often as necessary without
detrimentally affecting the strength of the screwed assembly, providing the specified tightening torque is
observed. For this reason it is essential to use a torque wrench.
Fastener Thread For component Torque Remarks
size Nm lbf.ft
Spline screw IS-DG4x15 Chain brake cover 2.0 1.5
Spline screw IS-DG4x15 Handle molding 1.6 1.2
Spline screw IS-DG4x15 Connector 2.5 1.8
(engine/oil pump)
Spline screw IS-DG4x15 Ground wire 3.5 2.6
(to cylinder)
Spline screw IS-DG5x24 Handle housing/ 3.5 2.6
front handle
Spline screw IS-DG5x24 Hand guard 3.5 2.6
Spline screw IS-DG5x24 Hand guard 3.7 2.8 1)
Spline screw IS-DG5x24 Fan housing 3.5 2.6
Spline screw IS-DG5x24 Buffer (to front handle) 3.5 2.6
Spline screw IS-DG5x24 Buffer (to engine) 3.5 2.6
Spline screw IS-DG5x24 Ignition module 4.0 3.0
(to engine housing)
Spline screw IS-DG5.3x40 Cylinder 9.5 7.0
(to engine housing)
Collar screw DG8x18 Guide bar mounting 16.0 11.8
Collar screw (rear) DG8x18 Guide bar mounting 8.0 5.9 3)
M12x1L Carrier (clutch) 50.0 37.0
M14x1.25 Spark plug 25.0 18.5
Hexagon nut M5 Muffler 7.0 5.2
Hexagon nut M5 Filter housing/carburetor 2.7 2.0
Collar nut M8x1 Flywheel to crankshaft 28.0 21.0
M12x1.5 Decompression valve 14.0 10.3 2)
Slotted nut M5 Filter base/carburetor 2.0 1.5 1)
Spline screw IS-DG5x16 Spiked bumper 3.7 2.8
Use the following procedure to fit a DG screw in an existing thread:
– Place the DG screw in the hole and rotate it counterclockwise until drops down slightly.
– Tighten the screw clockwise to the specified torque.
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread,
which would weaken the assembly.
1) 023 L
2) On easy start version only
3) With quick chain adjuster
Note: Power screwdriver speed settings for polymer: Plastoform screws max. 600 rpm
DG screws max. 500 rpm
3.6 Tightening Torques
021, 023, 025 5
6. Onlineversion
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- Remove the chain sprocket
cover.
• Disengage the chain brake by
pulling the hand guard toward
the front handle.
• Remove the E-clip (1).
• Remove the washer (2).
- Remove the rim sprocket, if fitted.
• Pull off the clutch drum/chain
sprocket.
• Take the needle cage out of the
sprocket.
- Clean and inspect the clutch
drum/chain sprocket.
Important: If there are noticeable
wear marks on the inside diameter
of the clutch drum, check its wall
thickness. If it is less than 80% of
the original wall thickness, fit a
new clutch drum.
Note: If the clutch drum has to be
replaced, also check the brake
band - see 4.4.2.
• If the clutch drum/chain sprocket
is still serviceable, use No. 120
emery paper or emery cloth
(grain size approx. 120µm) to
clean and roughen its friction
surface.
Reassemble in the reverse
sequence.
- Clean stub of crankshaft.
Wash needle cage in clean white
spirit and lubricate with grease -
see 11.2.
- Replace damaged needle cage.
- Rotate clutch drum/chain
sprocket and apply slight
pressure at the same same until
oil pump drive spring engages
properly.
- If rim sprocket was fitted, re-
install it with the cavities facing
outward.
4. CLUTCH, CHAIN DRIVE, CHAIN BRAKE, CHAIN TENSIONER
4.1 Clutch Drum/Chain Sprocket
VA143RA007
VA170RA005
80%
100%
145RA006
!
VA
6 021, 023, 025
7. Onlineversion
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Sprocket cover with integrally
molded chain catcher (1).
If the chain catcher has broken
off (2), repair as follows:
• Pry the plug out of the front right-
hand AV element.
• Oil the cylindrical part (1) of the
replacement chain catcher.
• Push the chain catcher into the
AV element (2) and engage the
peg (3) in the housing bore (4) at
the same time.
Troubleshooting chart - see
"Standard Repairs, Trouble-
shooting" handbook.
- Remove the clutch drum/chain
sprocket - see 4.1.
- Remove the air filter - see 10.1.
- On 023 L, remove the filter base -
see 10.2.2.
• Take out the shutter.
- Pull boot off the spark plug and
then unscrew the spark plug.
- Close the decompression valve,
if fitted.
• Push the locking strip (1)
0000 893 5903 into the cylinder.
• Unscrew clutch from the
crankshaft clockwise (left-hand
thread).
- Service the clutch - see
"Standard Repairs,
Trouble-shooting" handbook.
• Screw on the clutch and tighten
down to 50 Nm (37 lbf.ft).
- Install the clutch drum/chain
sprocket - see 4.1.
4.2 Chain Catcher 4.3 Clutch
VA135RA023
VA135RA022
1
VA135RA024
021, 023, 025 7
8. Onlineversion
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- Remove locking strip from
cylinder.
- Insert spark plug and tighten
down to 25 Nm (18.5 lbf.ft).
• If spark plug has a separate
terminal nut, make sure it is
properly tightened down.
- Fit boot on the spark plug.
• Fit the shutter so that its lugs
engage the recesses in the
handle housing.
- Install the air filter - see 10.1.
The chain brake is one of the most
important safety devices on the
chainsaw. Its efficiency is
measured in terms of the chain
braking time, i.e. the time that
elapses between activating the
brake and the saw chain coming
to a complete standstill. The
shorter the braking time, the better
the efficiency and protection
offered against being injured by
the rotating chain.
Contamination (with chain oil,
chips, fine particles of abrasion,
etc.) and smoothing of the friction
surfaces of the brake band and
clutch drum impair the coefficient
of friction. This, in turn, reduces
the frictional forces and thus
prolongs the braking time. A
fatigued or stretched brake spring
has the same negative effect.
- Start the engine.
- With the chain brake activated
(locked), open throttle wide for
a brief period (max. 3 seconds) -
the chain must not rotate.
- With the chain brake released,
open throttle wide and activate
the brake manually - the chain
must come to an abrupt
stop.
Note: The braking time is in
order if deceleration of the
saw chain is imperceptible to
the eye.
- Remove the clutch drum/chain
sprocket - see 4.1.
- Release brake spring tension by
pushing hand guard forward.
- Remove upper bumper strip from
tensioner.
• Take out the screws.
- Remove the cover.
• Carefully ease the brake spring
off the anchor pin and take it off
the bell crank.
4.4 Chain Brake
4.4.1 Checking Function 4.4.2 Disassembly
250RA008VA
VA135RA026
8 021, 023, 025
9. Onlineversion
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• Pry the brake band out of the
engine housing.
- Disconnect brake band from bell
crank.
Replace the brake band if:
- there are noticeable signs of
wear (large areas on inside
diameter and/or parts of outside
diameter) and
- its remaining thickness is
< 0.6 mm (0.024").
Important! Thickness of brake
band must not be less at any point.
• If the brake band is still
serviceable, use No. 120 emery
paper or emery cloth (grain size
approx. 120µm) to clean and
roughen its entire friction surface
(inside diameter).
• Take out the screw.
• Remove the E-clip.
• Remove strap from bell crank
pivot pin (1).
• Push the strap sideways and lift
it off the hand guard pivot pin (2).
• Remove the washer.
• Carefully pry the hand guard (1)
and bell crank (2) off their pivot
pins and lift away together.
- Pull the bell crank out of the
hand guard.
• Up to serial number
X 28 310 254, remove the
spring (1).
• Pull out the cam lever (2).
VA135RA027VA170RA014
VA135RA028VA135RA029VA135RA030
2 1 VA135RA031135RA032
1
2
VAVA135RA033
1
2
021, 023, 025 9
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NOTE:
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11. Onlineversion
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• From serial number
X 28 310 255, remove the flat
spring.
- Inspect parts and replace if
damaged.
- Clean the entire housing recess
for the chain brake.
- If the groove of the brake spring
anchor pin is worn, replace the
housing.
- Lubricate sliding and bearing
points of chain brake with STIHL
multipurpose grease or,
preferably, Molykote grease -
see 11.2.
- From serial number
X 28 310 255, install the flat
spring.
- Up to serial number
X 28 310 254, fit the cam lever.
• Attach spring to cam lever (open
side of spring hook facing
outwards) and slip it over the
pivot pin
• Insert the bell crank in the side of
the hand guard so that the short
arm of the bell crank points to
top of hand guard.
• Position the hand guard (1)
against the pivot pin and fit the
other side of the hand guard
over the housing.
• Position the bell crank (2)
against the pivot pin.
• Press the cam lever (3) slightly
downward and push the hand
guard and bell crank onto their
pivot pins.
• Check that cam lever or flat
spring (1) is properly located on
face (2) of hand guard bearing
boss.
4.4.3 Assembly
VA135RA034
VA135RA035
2
1
3
VA135RA036
1
2
10 021, 023, 025
12. Onlineversion
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• Fit the washer on the pivot pin.
• Fit strap on the pivot pin (1)
and locate it in the pivot pin’s
groove.
• Slip the other end of the strap
over the bell crank pivot pin (2).
- Secure strap with E-clip.
- Coat brake band with chain oil
(STIHL Bioplus), see 11.2, to
protect it from corrosion and help
reduce "snatching" during the
first few brake applications.
• Hook the brake spring onto the
bell crank.
• Position the brake band around
the clutch and push it into the
engine housing.
• Attach the brake spring to the
bell crank.
• Use the assembly (2)
1117 890 0900 to attach the
brake spring (1) to the anchor
pin.
- Fit the bushing in the hand guard.
- Insert M5x24 screw and tighten
down to 3.5 Nm (2.6 lbf.ft).
• On 023 L, push the rubber
bushing (1) into the hand guard
(2).
- Insert M5x32 screw (3) and
tighten down to 3.7 Nm
(2.8 lbf.ft).
- Fit the cover.
- Tighten screws to 2.0 Nm
(1.5 lbf.ft).
- Install clutch drum/chain
sprocket - see 4.1.
- Check operation of chain brake -
see 4.4.1.
VA135RA031
VA135RA038
VA135RA041
1
2
VA135RA037
1 2
VA135RA039
VA135RA042
1
2
3
VA135RA040
021, 023, 025 11