Echo srm-251e User manual

WARNING DANGER
Readrulesforsafeoperationandinstructionscarefully. ECHOprovidesanOperator's
ManualandaSafetyManual. Bothmustbereadandunderstoodforproperandsafe
operation.
Grass Trimmer/Brush Cutter
Operator'sManual
MODEL SRM - 251
SRM - 251E
X7502021603 X750007283
03/06

2
Specifications, descriptions and illustrative material in this
literature are as accurate as known at the time of publica-
tion, but are subject to change without notice. Illustra-
tions may include optional equipment and accessories,
and may not include all standard equipment.
TABLE OF CONTENTS
Introduction .................................................................... 2
- The Operator's Manual............................................. 2
- The Safety manual .................................................... 2
Safety .............................................................................. 3
- Manual Safety Symbols and Important Information 3
- InternationalSymbols .............................................. 3
- Personal Condition and Safety Equipment .............. 4
- EquipmentCheck ..................................................... 6
EmissionControl............................................................. 8
Description ..................................................................... 7
Contents ......................................................................... 9
Assembly ...................................................................... 10
- PlasticShieldInstallation....................................... 10
- Nylon Head Installation......................................... 10
- Front Handle Installation ....................................... 11
Operation ...................................................................... 12
- Fuel ........................................................................ 12
- StartingColdEngine .............................................. 13
- StartingWarmEngine............................................ 14
- Stopping Engine .................................................... 14
Maintenance ................................................................. 15
- SkillLevels ............................................................. 15
- Maintenance Intervals ........................................... 15
- AirFilter................................................................. 16
- FuelFilter ............................................................... 16
- SparkPlug .............................................................. 17
- CoolingSystem...................................................... 17
- ExhaustSystem...................................................... 18
- Carburetor Adjustment .......................................... 19
- Lubrication............................................................. 21
- NylonLineReplacement ........................................ 22
Troubleshooting ........................................................... 23
Storage.......................................................................... 24
Specifications................................................................ 25
ServicingInformation.................................................... 28
- Parts/SerialNumber ............................................... 28
- ECHOConsumerProductSupport......................... 28
- Service ................................................................... 28
- Warranty Card ....................................................... 28
- Additional or Replacement Manuals ..................... 28
Copyright©2006ByEcho,Incorporated
All Rights Reserved.
INTRODUCTION
Welcome to the ECHO family. This ECHO product was designed and manufactured to provide long life and on-the-job
dependability. Read and understand this manual. You will find it easy to use and full of helpful operating tips and
SAFETYmessages.
THE OPERATOR’SMANUAL
Read and understand this manual before operation. Keep it in a safe
place for future reference. It contains specifications and information for
operation, starting, stopping, maintenance, storage, and assembly
specific to this product.
THE SAFETY MANUAL
Read and understand this manual before operation. Keep it in a safe
place for future reference. It explains possible hazards involved with the
use of this product and what measures you should take to make their
use safer.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 3
INTERNATIONAL SYMBOLS
Hot
Surface
Carburetor
Adjustment
-Idlespeed
Carburetor
Adjustment
- High speed
mixture
DESCRIPTION SYMBOLSYMBOL
"WARNING, SEE
OPERATOR'S
MANUAL
Weareye,ear
and head
protection
Emergency
Stop Fueland oil
mixture
FingerSevering
Carburetor
Adjustment
-Lowspeed
mixture
Primer
Bulb
Ignition
ON/
OFF
Wear hand and
foot protection
Safety/Alert
Keepbystandersandhelpers
away15m(50ft.).
DONOTsmoke
nearfuel.
DONOTallow
flamesorsparks
nearfuel.
DESCRIPTION SYMBOL DESCRIPTION SYMBOL DESCRIPTION
Choke Control
"Cold Start"
Position
(ChokeClosed)
Choke Control
"Run"
Position
(ChokeOpen)
Do not use
blades.String
lineonly
IMPORTANT
The enclosed message provides
information necessary for the protec-
tion of the unit.
NOTE
This enclosed message provides tips
for use, care and maintenance of the
unit.
Throughout this manual and on the product itself, you will find safety
alerts and helpful, informational messages preceded by symbols or key
words. The following is an explanation of those symbols and key
words and what they mean to you.
SAFETY
MANUAL SAFETY SYMBOLS AND IMPORTANT INFORMATION
This symbol accompanied by the words WARNING and
DANGER calls attention to an act or condition that can lead
to serious personal injury to operator and bystanders.
The circle with the slash symbol means whatever is shown
within the circle is prohibited.

4
Physical Condition
Your judgment and physical dexterity may not be good:
• if you are tired or sick,
• ifyouaretakingmedication,
• if you have taken alcohol or drugs.
Operate unit only if you are physically and mentally well.
Eye Protection
Wear eye protection that meets ANSI Z87.1 or CE requirements whenever you operate the unit.
Hand Protection
Wear no-slip, heavy-duty work gloves to improve your grip on the handle. Gloves also reduce the transmission of
machine vibration to your hands.
Hearing Protection
ECHO recommends wearing hearing protection whenever unit is used.
Proper Clothing
Wear snug fitting, durable clothing;
• Pants should have long legs, shirts with long sleeves.
• DONOTWEARSHORTS,
• DONOTWEARTIES,SCARFS,JEWELRY.
Wear protective hair covering to contain long hair.
Wear sturdy work shoes with nonskid soles;
• DONOTWEAROPENTOEDSHOES,
• DONOTOPERATEUNITBAREFOOTED.
Hot Humid Weather
Heavy protective clothing can increase operator fatigue which may lead to heat stroke. Schedule heavy work for early
morning or late afternoon hours when temperatures are cooler.
WARNING DANGER
Users of this product risk injury to themselves and others if the unit is used improperly and/or safety precautions
are not followed. Proper clothing and safety gear must be worn when operating unit.
PERSONAL CONDITION AND SAFETY EQUIPMENT
Extended Operation/Extreme Conditions
It is believed that a condition called Raynaud’s Phenomenon, which affects the fingers of certain individuals, may be
brought about by exposure to vibration and cold. Exposure to vibration and cold may cause tingling and burning
sensations, followed by loss of color and numbness in the fingers. The following precautions are strongly recom-
mended,becausetheminimumexposure,which might trigger the ailment, is unknown.
• Keep your body warm, especially the head, neck, feet, ankles,
hands, and wrists.
• Maintain good blood circulation by performing vigorous arm
exercises during frequent work breaks, and also by not smoking.
• Limit the hours of operation. Try to fill each day with jobs where
operating the unit or other hand-held power equipment is not
required.
• If you experience discomfort, redness, and swelling of the fingers
followed by whitening and loss of feeling, consult your physician
before further exposing yourself to cold and vibration.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 5
WARNING DANGER
Do not operate this product indoors or in inadequately ventilated
areas. Engine exhaust contains poisonous emissions and can
cause serious injury or death.
Read the Manuals
• Provide all users of this equipment with the Operator’s Manual and
Safety Manual for instructions on Safe Operation.
Clear the Work Area
• Spectators and fellow workers must be warned, and children and
animalspreventedfrom comingnearerthan 15m(50 ft.)whilethe
unit is in use.
Keep a Firm Grip
• Hold the front and rear handles with both hands, with thumbs and
fingers encircling the handles.
Keep a Solid Stance
• Maintain footing and balance at all times. Do not stand on slippery,
uneven or unstable surfaces. Do not work in odd positions or on
ladders. Do not over reach.
Avoid Hot Surfaces
• Keep exhaust area clear of flammable debris. Avoid contact during
andimmediatelyafteroperation.
Repetitive Stress Injuries
It is believed that overusing the muscles and tendons of the fingers, hands, arms, and shoulders may cause soreness,
swelling, numbness, weakness, and extreme pain in those areas. Certain repetitive hand activities may put you at a high
riskfordeveloping a RepetitiveStressInjury(RSI). An extremeRSIcondition is CarpalTunnelSyndrome(CTS), which
could occur when your wrist swells and squeezes a vital nerve that runs through the area. Some believe that prolonged
exposure to vibration may contribute to CTS. CTS can cause severe pain for months or even years.
To reduce the risk of RSI/CTS, do the following:
• Avoid using your wrist in a bent, extended, or twisted position.
Instead try to maintain a straight wrist position. Also, when
grasping, use your whole hand, not just the thumb and index finger.
• Take periodic breaks to minimize repetition and rest your hands.
• Reduce the speed and force with which you do the repetitive
movement.
• Do exercise to strengthen the hand and arm muscles.
• Immediately stop using all power equipment and consult a doctor if
you feel tingling, numbness, or pain in the fingers, hands, wrists, or
arms. The sooner RSI/CTS is diagnosed, the more likely permanent
nerve and muscle damage can be prevented.

6
EQUIPMENT CHECK
WARNING DANGER
Use only ECHO approved attachments. Serious injury may result from the use of a non-approved attachment
combination. ECHO, INC. will not be responsible for the failure of cutting devices, attachments or accessories which
have not been tested and approved by ECHO. Read and comply with all safety instructions listed in this manual and
safety manual.
• Check unit for loose/missing nuts, bolts, and screws. Tighten and/
or replace as needed.
• Inspect fuel lines, tank, and area around carburetor for fuel leaks.
DO NOT operate unit if leaks are found.
• Inspect shield for damage and ensure that the cut-off knife is
securely in place. Replace if either is damaged or missing.
• Check that the cutting attachment is firmly attached and in safe
operating condition.
• Check that front loop handle and shoulder strap/ or shoulder/
waist harness are adjusted for safe, comfortable operation. See
Assembly Section for proper adjustment.
AnEmissionControlLabelis locatedonthe engine. (Thisisan EXAMPLEONLY,information onlabelvaries byengine
FAMILY).
PRODUCTEMISSIONDURABILITY
The 300 hour emission durability compliance period is the time span selected by the manufacturer certifying the
engine emissions output meets applicable emissions regulations, provided that approved maintenance procedures are
followed as listed in the Maintenance Section of this manual.
EMISSION CONTROL
EPA Phase 2 SRM-251E
The emission control system for this engine is EM (Engine
Modification).
IMPORTANTENGINEINFORMATION
ENGINEFAMILY: 6EHXS.0254ED DISPLACEMENT: 25.4CC
EMISSIONCOMPLIANCEPERIOD :300HRS.
THISENGINEMEETSU.S.EPAPHASE2EMISSIONREGULATIONS
FOR SMALL NONROAD ENGINES. REFER TO OWNER'S MANUAL
FORMAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
California Tier 2 SRM-251
The emission control system for these engines is EM/
TWC(EngineModificationandCatalyst).
IMPORTANTENGINEINFORMATION
ENGINE FAMILY: 6EHXS.0254KE DISPLACEMENT: 25.4 cc
EMISSION COMPLIANCE PERIOD: 300 Hours
THIS ENGINE MEETS U.S. EPA PH2 AND 2005 - 2006
CALIFORNIA EXH EMISSION REGULATIONS FOR SORES.
REFER TO OWNER'S MANUAL FOR MAINTENANCE SPECIFI-
CATIONS AND ADJUSTMENTS.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 7
DESCRIPTION
P/N 89022809560
P/N 89016054130
1
2
3
4
5
6
78
9
13
11
12
14
17
18
15
16
P/N 89016006361
10
Locate these safety decals on your unit. Make sure the decals are legible and that you understand and follow the
instructions on them. If a decal cannot be read, a new one can be ordered from your ECHO dealer. See PARTS ORDER-
INGinstructionsforspecificinformation.
Hot Decal (near muffler)
Shaft Decals
P/N 89016054130
P/N 89022809560
P/N X505001930
P/N X505001930

8
1. POWERHEAD-IncludestheEngine,Clutch,FuelSystem,IgnitionSystemandRecoilStarter.
2. GRIP-Rear(righthand)handle.
3. THROTTLETRIGGERLOCKOUT-Thislevermustbeheldduringstarting.Operationofthethrottletriggeris
prevented unless throttle trigger lockout lever is engaged.
4. STOPSWITCH- "SLIDE SWITCH" mounted on top of the Throttle Trigger Housing. Move switch FORWARD to
RUN,BACKtoSTOP.
5. FRONT HANDLE - The Front (loop) handle is loosely assembled to the Drive Shaft assembly and must be positioned
for proper cutting attitude and operator comfort.
6. NYLONCUTTERHEAD-Containsreplaceablenylontrimminglinethatadvanceswhenthetrimmerheadistapped
against the ground while the head is turning at normal operating speed.
7. CUT-OFFKNIFE-Automatically trimslinetothecorrectlength:5"afterheadistappedontheground.If trimmeris
operated without a cut-off knife the line will become too long, the engine will overheat and engine damage may occur.
8. PLASTICDEBRISSHIELDASSEMBLY-Includedinplasticbag(co-pack). MUSTbeinstalledonunitbeforeuse,
see Assembly Instructions. Shield assembly includes the Cut-Off Knife. Mounts on the Gear Housing Assembly just
above the cutting attachment. Helps protect the operator by deflecting debris produced during the trimming operation.
9. DRIVESHAFTASSEMBLY-IncludestheRear(righthand)Handleassembly,GearHousingassembly,Front(loop,
left hand) Handle assembly, steel drive shaft and Safety Decal.
10. THROTTLETRIGGER-Springloadedtoreturntoidlewhenreleased. Duringacceleration,presstriggergraduallyfor
best operating technique.
11. SPARKARRESTOR-CATALYTICMUFFLER/MUFFLER-Themufflerorcatalyticmufflercontrolsexhaustnoise
and emission. The spark arrestor screen prevents hot, glowing particles of carbon from leaving the muffler. Keep
exhaustareaclearofflammabledebris.
12. FUELTANK-Containsfuelandfuelfilter.
13. I-30RECOILSTARTER/HANDLE-i30spring-assistedrecoilstarter requires30%lesspullingforcethanstandard
recoil starter. Pull handle slowly until starter engages, then quickly and firmly. When engine starts, return handle
slowly. DO NOT let handle snap back or damage to unit will occur.
14. FUELTANKCAP-Coversandsealsfueltankopening.
15. CHOKE - The choke control is located on the top of the air filter case. Move choke lever to "Cold Start" ( ) to
close choke for cold start. Move choke lever to "Run" ( ) position to open choke.
16. AIRCLEANER-Containsreplaceablefilterelement.
17. PURGEBULB- Pumping purge bulb before starting engine draws fresh fuel from the fuel tank, purging air from the
carburetor. Pump purge bulb until fuel is visible and flows freely in the clear fuel tank return line. Pump purge bulb
an additional 4 or 5 times.
18. SPARKPLUG-Providessparktoignitefuelmixture.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 9
CONTENTS
The ECHO product you purchased has been partially assembled for your convenience. Due to packaging restrictions,
installation of the plastic debris shield, nylon line head, and positioning of the front handle may be necessary.
After opening the carton, check for damage. Immediately notify your retailer or ECHO Dealer of damaged or missing
parts. Use the contents list to check for missing parts.
*Some units may be factory pre-assembled. No assembly tools are needed and the nylon line head, plastic debris shield,
and mounting hardware, shown in the contents list, are pre-assembled to the unit. Only the front handle may need to be
re-positioned for comfortable operation.
______1 - Power Head / Drive Shaft Assembly
______1 - Operator's Manual
______1 - Safety Manual
______1 - Warranty Registration Card
______1 - LimitedWarrantyStatement
______1 - Safety Glasses
______1 - Echo PowerBlendTM 2-stroke oilsample
* ___ 1 - NylonTrimmerHead
* ___ 1 - T-wrench17x19,P/N89541008030
* ___ 1 - Lockingtool,P/N89751801131
* ___ 1 - Plasticshield
* ___ 1 - Shieldplate
* ___ 3 - 5mmx16mmscrews(shieldmtg.)

10
ASSEMBLY
Tools Required: Screwdriver,HeadLockingTool,17x19mmT-Wrench
Parts Required: PlasticShield,ShieldPlate,three(3)5mmx16mm
screws, Nylon Line Head
PLASTIC SHIELD INSTALLATION
(For Nylon Line Operation)
NOTE
The plastic shield is for use with the Nylon Line Head only.
1. Remove plastic sleeve and upper plate (A) from PTO shaft.
2. Install the shield on the bottom of the bearing housing flange.
3. Place shield plate (B) on shield, align holes and install three (3)
5x16mmscrews.
4. Install upper plate (A).
B
A
C
NYLON LINE HEAD INSTALLATION
1. Align hole in upper plate with notch in edge of gear housing and
insert head locking tool (C). Remove plastic sleevefromPTOshaft.
2. Be sure upper plate (A) remains on PTO shaft.
3. Thread line head onto PTO shaft by turning it counter clockwise
until head is tight against upper plate.
4. Removelockingtool(C).

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 11
FRONT HANDLE INSTALLATION
NOTE
Label shows minimum spacing for front handle location.
1. Position front handle for comfortable operation and secure screws.
MIN
SPACING

12
OPERATION
FUEL
NOTICE:Useofunmixed,improperlymixed,orfuelolderthan90
days, (stale fuel), may cause hard starting, poor performance, or
severe engine damage and void the product warranty. Read and
follow instructions in the Storage section of this manual.
Fuel Requirements
Gasoline-Use 89Octane[R+M/2] (mid gradeorhigher) gasoline
known to be good quality. Gasoline may contain up to 15% MTBE
(methyl tertiary-butyl ether). Gasohol containing methyl (wood) alcohol
is NOT approved.
TwoStrokeOil-Atwo-strokeengineoilmeetingISO-L-EGD(ISO/CD
13738)andJ.A.S.O.FC Standards must beused. Echo brand premium
Power Blend TM Universal 2-Stroke Oil meets these standards. Engine
problems due to inadequate lubrication caused by failure to use an
ISO-L-EGDandJ.A.S.O.FCcertifiedoil,suchasEchopremiumPower
BlendTM,will voidthetwo-stroke engine warranty. (Emissionrelated
parts only are covered for two years, regardless of two-stroke oil used,
per the statement listed in the Emission Defect Warranty Explanation.)
IMPORTANT
EchopremiumPowerBlendTM Universal2-StrokeOilmaybemixed
at 50:1 ratio for application in all Echo engines sold in the past
regardless of ratio specified in those manuals.
Handling Fuel
WARNING DANGER
FuelisVERYflammable.Useextremecarewhenmixing,storingor
handling or serious personal injury may result.
• Use an approved fuel container.
• DONOTsmokenearfuel.
• DONOTallow flamesorsparks nearfuel.
• Fuel tanks/cans may be under pressure. Always loosen fuel
caps slowly allowing pressure to equalize.
• NEVERrefuelaunitwhentheengineisHOTorRUNNING!
• DONOTfillfueltanksindoors.ALWAYSfillfueltanks
outdoors over bare ground.
•DONOToverfillfueltank. Wipeupspillsimmediately.
• Securely tighten fuel tank cap and close fuel container after
refueling.
• Inspect for fuel leakage. If fuel leakage is found, do not start or
operate unit until leakage is repaired.
• Move at least 3m (10 ft.) from refueling location before starting
the engine.
oitaR1:05-xiMliOotleuF
.S.UCIRTEM
SAGLIOSAGLIO
snollaG.zo.lFretiL.cc
1
2
5
6.2
2.5
31
4
8
02
08
061
004
Mixing Instructions
1. Fill an approved fuel container with half
of the required amount of gasoline.
2. Add the proper amount of 2-stroke oil to
gasoline.
3. Close container and shake to mix oil with
gasoline.
4. Add remaining gasoline, close fuel
container,andremix.
IMPORTANT
Spilled fuel is a leading cause of
hydrocarbon emissions. Some states
may require the use of automatic fuel
shut-off containers to reduce fuel
spillage.
After use
• DO NOT store a unit with fuel in its
tank. Leaks can occur. Return unused
fuel to an approved fuel storage
container.
Storage - Fuel storage laws vary by locality.
Contact your local government for the laws
affecting your area. As a precaution, store
fuel in an approved, airtight container. Store
in a well-ventilated, unoccupied building,
away from sparks and flames.
IMPORTANT
Storedfuelages. Do notmixmorefuel
than you expect to use in thirty (30)
days, ninety (90) days when a fuel
stabilizerisadded.
IMPORTANT
Stored two-stroke fuel may separate.
ALWAYS shake fuel container thor-
oughly before each use.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 13
2. Choke
Move choke lever (B) to Cold Start Position ( ).
3. Purge Bulb
Pump purge bulb (C) until fuel is visible and flows freely in the clear
fuel tank return line. Pump bulb an additional 4 or 5 times.
4. Recoil Starter
Lay the unit on a flat area and keep movable attachment parts clear
of all obstacles. Firmly grasp right hand grip and throttle trigger
lockout with left hand and fully depress throttle trigger to wide open
position. Rapidly pull recoil starter handle/rope (D) until engine fires
(ormaximumfive[5]pulls).
5. Choke
After engine fires (or 5 pulls), move choke lever back to Run ( )
position. Hold throttle trigger and throttle trigger lockout fully
depressed, and pull recoil starter starter handle/rope until engine
starts and runs. Allow engine to run at partial throttle for approxi-
mately 10 seconds. Release throttle trigger, and allow unit to warm
up at idle for several minutes.
NOTE
If engine does not start with choke in “Run” position after 5 pulls,
repeat instructions.
6. Throttle Trigger
After engine warm-up, gradually depress throttle trigger to increase
engine RPM to operating speed.
A
STARTING COLD ENGINE
WARNING DANGER
The attachment will operate immediately when the engine starts and
could result in loss of control and possible serious injury. Keep
movable parts of the attachment off the ground and away from
objects that could become entangled or thrown.
1. Stop Switch
Move stop switch button (A) forward away from the STOP position.
C
B
D

14
STARTING WARM ENGINE
The starting procedure is the same as Cold Start except DO NOT close
the choke, and do not depress throttle trigger to wide open position.
WARNING DANGER
The attachment should not move at idle, otherwise serious personal
injurymayresult.
NOTE
If attachment moves, readjust carburetor according to “Carburetor
Adjustment” instructions in this manual or see your ECHO Dealer.
1. Stop Switch
Move stop switch button (A) away from the STOP position.
A
2. Purge Bulb
Pump purge bulb (C) until fuel is visible and flows freely in the clear
fuel tank return line. Pump bulb an additional 4 or 5 times.
3. Recoil Starter
Lay the unit on a flat area and keep movable attachment parts clear
of all obstacles. Rapidly pull recoil starter handle/rope (D) until
enginefires.
NOTE
If engine does not start after 5 pulls, use Cold Start Procedure.
D
C
STOPPING ENGINE
1. Throttle
Release throttle and allow engine to return to idle before shutting off
engine.
2. Stop Switch
Move stop switch button (A) backward to STOP position.
WARNING DANGER
If engine does not stop when stop switch is moved to STOP
position, close choke - COLD START position - to stall engine.
HaveyourECHOdealerrepair stop switch before using trimmer
again.
A
B

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 15
/TNENOPMOC
METSYS
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ERUDECORP
D'QER
LLIKS
LEVEL
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EROFEB
ESU
YREVE
LEUFER
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09RO
SRUOH
6
SHTNOM
072RO
SRUOH
YLRAEY
006
SRUOH
serudecorPecnanetniaMrelaeDohcEdednemmoceR
troPtsuahxErednilyCnobraceD/naelC/tcepsnI 3C/I
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MAINTENANCE
Your ECHO unit is designed to provide many hours of trouble free service. Regular scheduled maintenance will help
your unit achieve that goal. If you are unsure or are not equipped with the necessary tools, you may want to take your
unit to an ECHO Service Dealer for maintenance. To help you decide whether you want to DO-IT-YOURSELF or have
the ECHO Dealer do it, each maintenance task has been graded. If task is not listed, see your ECHO Dealer for repairs.
SKILL LEVELS
Level1= Easy to do. Most required tools come with unit.
Level2= Moderate difficulty. Some specialized tools may be required.
Level3= Experience required. Specialized tools are required. Echo recommends that the unit be returned to your
ECHOdealerforservice.
ECHO offers REPOWERTM Maintenance Kits and Parts to make your maintenance job easier. Just below each task
heading are listed the various part numbers required for that task. See your ECHO dealer for these parts.
MAINTENANCE INTERVALS

16
AIR FILTER
Level1.
Tools Required: Cleaningbrush25or50mm(1or2in.)
Parts Required: 90008REPOWERTMAIR&FUELFILTERKIT.
1. Close choke (Cold Start Position [ ]). This prevents dirt from
entering the carburetor throat when the air filter is removed. Brush
accumulateddirtfromaircleanerarea.
2. Remove airfilter cover.Brush dirtfrom insidecover.
3. Removeairfilterandlightlybrushdebrisfromfilter.Replacefilterifit
is damaged, fuel soaked, very dirty, or the rubber sealing edges are
deformed.
4. If filter can be reused, be certain it:
• Fits tightly in the air filter cavity.
• Is installed with the original side out.
5. Installairfiltercover.
FUEL FILTER
Level1.
Tools Required: 200-250mm(8-10in.)lengthofwire with one end bent
into a hook, clean rag, funnel, and an approved fuel
container.
Parts Required: 90008REPOWERTMAIR&FUELFILTERKIT.
WARNING DANGER
FuelisVERYflammable.Useextremecarewhenmixing,storingor
handling.
1. Use a clean rag to remove loose dirt from around fuel cap and
emptyfueltank.
2. Use the “fuel line hook” to pull the fuel line and filter from the
tank.
3. Remove the filterfromtheline and install thenewfilter.

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 17
SPARK PLUG
Level2.
Tools Required: T-Wrench, feeler gauge, soft metal brush.
Parts Required: REPOWERTM Tune-UpKit P/N90074
IMPORTANT
UseonlyNGKBPM-8Ysparkplug(BPMR-8YinCanada)otherwise
severe engine damage may occur.
1. Remove spark plug and check for fouling, worn and rounded
center electrode.
2. Clean the plug or replace with a new one. DO NOT sand blast to
clean.Remainingsandwilldamageengine.
3. Adjust spark plug gap by bending outer electrode.
4. Tightensparkplugto150-170kg/cm(130-150in.lb.).
COOLING SYSTEM
Level2.
Tools Required: 3&4mmHexWrench,cleaningbrush,25or50mm
(1or2in.)
Parts Required: None if you are careful.
IMPORTANT
To maintain proper engine operating temperatures, cooling air
must pass freely through the cylinder fin area. This flow of air
carries combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked, preventing cooling air from reaching the
cylinder.
• Dust and grass build up on the outside of the cylinder. This build
up insulates the engine and prevents the heat from leaving.
Removal of cooling passage blockages or cleaning of cooling fins is
considered “Normal Maintenance.” Any failure attributed to lack of
maintenance is not warranted.
0.65 mm
(0.026 in.)

18
1. Remove spark plug lead (A).
2. Removeairfiltercover(B).
3. Removeone(1)mufflercoverscrewandmufflercover(C).
4. Remove two (2) screws and engine cover (D).
IMPORTANT
DO NOT use a metal scraper to remove dirt from the cylinder fins.
5. Use brush to remove dirt from the cylinder fins.
6. Remove grass and leaves from the grid between the recoil starter and
fueltank.
7. Assemble components in reverse order.
A
B
C
D
EXHAUST SYSTEM
Spark Arrestor Screen
Level2.
Tools Required: Cross Head Screwdriver, Soft Metal Brush,
4mmHexWrench
Parts Required: SparkArrestor Screen,Gasket
1. Remove spark plug lead.
2. Removeone(1)mufflercoverscrew andmufflercover.
3. Place piston at Top Dead Center (TDC) to prevent carbon/dirt from
enteringcylinder.
4. Remove spark arrestor screen cover (A), gasket (B) and screen (C)
frommufflerbody.
5. Clean carbon deposits from screen and muffler components.
NOTE
When cleaning carbon deposits, be careful not to damage the
catalyticelementinsidemuffler.
6. Replace screen if it is cracked, plugged or has holes burned through.
7. Assemble components in reverse order.
A
B
C
SRM-251E
A
B
C
SRM-251

GRASS TRIMMER/BRUSH CUTTER
OPERATOR'SMANUAL 19
Cylinder Exhaust Port
Level3.
IMPORTANT
The cylinder exhaust port must be inspected and cleaned of excess
carbon every 3 months or 90 hours of operation in order to maintain
this engine within the emissions durability period. ECHO strongly
recommends that you return your unit to your ECHO dealer for this
importantmaintenanceservice.
CARBURETORADJUSTMENT
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments can be made. During the break-in
period your engine performance will increase and exhaust emissions will
stabilize. Idle speed can be adjusted as required.
High Altitude Adjustment
High altitude adjustment is not required for proper operation of this
engine.
Level2.
Tools required: Screwdriver,tachometer(EchoP/N99051130017)
Parts required: None.
NOTE
Do not adjust carburetor unless necessary. If you have difficulty,
seeyourECHOdealer.
Adjustment Screws
Idle Speed (A) Controls throttle opening at idle.
Low(LO)Speed(B) Controls amount of fuel at low speed and
supplementary fuel for smooth progression from
idle to high speed.
High(HI)Speed(C) Controls amount of fuel at full throttle
A
B
C

20
Before Adjustment
Checkthat:
• Air filter is clean and properly installed.
• Spark arrestor screen and muffler are free of carbon.
• Nylonlinehead with lines trimmed to 8 in. is installed.
InitialAdjustment
1. With engine off, turn HI speed screw (C) counterclockwise to stop.
2. Turn LO speed screw (B) midway between stops.
3. Turn idle screw (A) until tip of screw just touches throttle plate; then
turn three (3) turns clockwise.
Final Adjustment
IMPORTANT
Limitercapsprevent exceeding emissionlimitsandover rich
adjustment, but not over lean adjustment, which can cause engine
failure: DonotexceedrecommendedHI speed engine R.P.M.
during operation, or for long periods during adjustment.
1. Start engine, run at idle for one minute.
2. Complete warm up by running at full throttle for 5 minutes, operating
choketwicetoclearair from carburetor chambers.
3. Run at idle and accelerate to check for smooth transition from idle to
high speed; if engine hesitates, turn LO speed screw (B) counter-
clockwise 1/8th of a turn at a time until acceleration is smooth.
4. Use a tachometer to adjust idle speed to specifications found on
page25.
A
B
C