MTD YM90 User Manual

English

Operator’s Manual

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

PRINTED IN U.S.A.
PART NO. 769-00573 (12/02)

2-Cycle Trimmer/

Brushcutter

Model

YM90

2

TABLE OF CONTENTS

Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page

Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Know Your Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Starting/Stopping Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Maintenance and Repair Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Back Cover

FINDING MODEL NUMBER

This Operator’s Manual is an important part of your new trimmer. It will help you assemble, prepare and maintain the
unit for best performance. Please read and understand what it says.

Before you start assembling your new equipment, please locate the model plate on the unit and
copy the information from it onto the space provided below. The information on the model plate is very
important if you need help from our Customer Support Department or an authorized dealer.

• The model number is located on the engine. A sample model plate is shown and explained below. For future
reference, please copy the model number and the serial number of the equipment in the space provided.

CALLING CUST

OMER SUPPOR

T

If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of
this unit, please call the Customer Support Department.

Call 1- (800)-345-8746, or 1- (800)-668-1238 in Canada, to reach a Customer Support representative.
Please have your unit’s model number and serial number ready when you call. You will be asked to
enter the serial number in order to process your call. This information is explained above.

VISIT OUR

WEB SITE

Visit our web site at www.yardman.com for more information about our quality Yard Man products, customer service,
parts, tips, literature and more.

Copy the model and parent

part number here:

Copy the serial number here:

MODEL :

S/N :

ITEM :

3

SPARK ARRESTOR

NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington. All U.S.
Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and Washington require, by
law that certain internal combustion engines operated on forest brush and/or grass-covered areas be equipped with a
spark arrestor, maintained in effective working order, or the engine be constructed, equipped and maintained for the
prevention of fire. Check with your state or local authorities for regulations pertaining to these requirements. Failure to
follow these requirements could subject you to liability or a fine. This unit is factory equipped with a spark arrestor.
If it requires replacement, ask your LOCAL SERVICE DEALER to install the accessory part #182747 Spark Arrestor.

W

ARNING!

Read the Operator’s Manual and follow all warnings and safety instructions. Failure to do so can
result in serious injury to the operator and/or bystanders.

FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR 1-800-668-1238 in CANADA

The purpose of safety symbols is to attract your attention to possible dangers. The safety symbols and
their explanations deserve your careful attention and understanding. The safety warnings do not by
themselves eliminate any danger. The instructions or warnings they give are not substitutes for proper
accident prevention measures.

SAFETY ALERT SYMBOL: Indicates danger, warning, or caution. Attention is required in order to avoid
serious personal injury. May be used in conjunction with other symbols or pictographs.

NOTE: Advises you of information or instructions vital to the operation or maintenance of the equipment.

DANGER: Failure to obey a safety warning will result in serious injury to yourself or to others. Always
follow the safety precautions to reduce the risk of fire, electric shock and personal injury.

WARNING: Failure to obey a safety warning can result in injury to yourself and others. Always follow
the safety precautions to reduce the risk of fire, electric shock and personal injury.

CAUTION: Failure to obey a safety warning may result in property damage or personal injury to
yourself or to others. Always follow the safety precautions to reduce the risk of fire, electric shock and
personal injury.

SECTION 1: IMPORTANT SAFE OPERATION PRACTICES

READ ALL INSTRUCTIONS

WARNING: When using the unit, you must
follow the safety rules. For your own safety
and that of bystanders, please read these
instructions before operating the unit.
Please keep the instructions for later use.

Before Operating

• Read the instructions carefully. Be familiar with the
controls and proper use of the unit.

• Do not operate this unit when tired, ill or under the
influence of alcohol, drugs or medication.

SECTION 1a:RULES FOR SAFE OPERATION

WARNING

California Proposition 65 Warning:

THE ENGINE EXHAUST FROM THIS

PRODUCT CONTAINS CHEMICALS

KNOWN TO THE STATE OF CALIFORNIA

TO CAUSE CANCER, BIRTH DEFECTS

OR OTHER REPRODUCTIVE HARM.

4

• Be aware of risk of injury to the head, hands and feet.

• Clear the area to be cut before each use. Remove
rocks, broken glass, nails, wire, string and other
objects which may be thrown or become entangled in
the cutting attachment. Clear the area of children,
bystanders and pets; keep them outside a 50-foot
(15 m.) radius, at a minimum. Even then, they are still
at risk from thrown objects. Encourage bystanders to
wear eye protection. If you are approached, stop the
unit immediately.

• Squeeze the throttle control and check that it returns
automatically to the idle position. Make all adjustments
or repairs before using the unit.

Safety Warnings for Gas Trimmers

WARNING: Gasoline is highly flammable,
and its vapors can explode if ignited. Take
the following precautions:

• Store fuel only in containers specifically designed and
approved for the storage of such materials.

• Always stop the engine and allow it to cool before
filling the fuel tank. Never remove the fuel tank cap or
add fuel when the engine is hot. Never operate the unit
without the fuel cap securely in place. Loosen the fuel
tank cap slowly to relieve any pressure in the tank.

• Add fuel in a clean, well-ventilated outdoor area where
there are no sparks or flames. Remove the fuel cap
slowly, and only after the engine stops. Do not smoke
while fueling or mixing fuel. Wipe up any spilled fuel
from the unit immediately.

• Avoid creating a source of ignition for spilled fuel. Do
not start the engine until fuel vapors dissipate.

• Move the unit at least 30 feet (9.1 m) from the fueling
source and site before starting the engine. Do not
smoke. Keep sparks and open flames away from the
area while adding fuel or operating the unit.

While Operating

• Never start or run the unit inside a closed room or
building. Breathing exhaust fumes can be fatal.
Operate this unit only in a well-ventilated outdoor area.

• Wear safety glasses or goggles that meet ANSI Z87.1
standards and are marked as such. Wear ear/hearing
protection when operating this unit. Wear a face or
dust mask if the operation is dusty.

• Wear heavy long pants, boots, gloves and a long
sleeve shirt. Do not wear loose clothing, jewelry, short
pants, sandals or go barefoot. Secure hair above
shoulder level.

• The cutting attachment shield must always be in place
while operating the unit. Do not operate unit without
both trimming lines extended, and the proper line
installed. Do not extend the trimming line beyond the
length of the shield.

• This unit has a clutch. The cutting attachment remains
stationary when the engine is idling. If it does not, have
the unit adjusted by an authorized service technician.

• Adjust the J-handle to your size in order to provide the
best grip.

• Be sure the cutting attachment is not in contact with
anything before starting the unit.

• Use the unit only in daylight or good artificial light.

• Avoid accidental starting. Remain in the starting
position whenever pulling the starter rope. The
operator and unit must be in a stable position while
starting. Refer to Starting/Stopping Instructions.

• Use the right tool. Only use this tool for its intended
purpose.

• Do not overreach. Always keep proper footing and
balance.

• Always hold the unit with both hands when operating.
Keep a firm grip on both handles or grips.

• Keep hands, face, and feet at a distance from all
moving parts. Do not touch or try to stop the cutting
attachment when it rotates.

• Do not touch the engine, gear housing or muffler.
These parts get extremely hot from operation, even
after the unit is turned off.

• Do not operate the engine faster than the speed
needed to cut, trim or edge. Do not run the engine at
high speed when not cutting.

• Always stop the engine when cutting is delayed or
when walking from one cutting location to another.

• If you strike or become entangled with a foreign
object, stop the engine immediately and check for
damage. Do not operate before repairing damage. Do
not operate the unit with loose or damaged parts.

• Stop the unit, switch the engine to off, and disconnect
the spark plug for maintenance or repair.

• Use only Genuine Factory Parts™ replacement parts
and accessories for this unit. These are available from
your authorized service dealer. Use of any unauthorized
parts or accessories could lead to serious injury to the
user, damage to the unit, and a voided warranty.

• Keep unit clean of vegetation and other materials.
They may become lodged between the cutting
attachment and shield.

• Children under the age of 15 must not use the unit;
teens may operate the unit with adult guidance.

• Inspect the unit before use. Replace damaged parts.
Check for fuel leaks. Make sure all fasteners are in
place and secure. Replace cutting attachment parts
that are cracked, chipped or damaged in any way.
Make sure the cutting attachment is properly installed
and securely fastened. Be sure that the cutting
attachment shield is properly attached, and positioned
as recommended. Failure to do so can result in
personal injury to the operator and bystanders, as well
as damage to the unit.

• Use only 0.095-inch (2.41 mm) diameter Genuine
Factory Parts™ replacement line. Never use metal­reinforced line, wire, chain or rope. These can break
off and become dangerous projectiles.

5

• To reduce fire hazard, replace a faulty muffler and
spark arrestor. Keep the engine and muffler free from
grass, leaves, excessive grease or carbon build up.

While Operating with the Cutting Blade

• Read and understand all safety warnings before
operating this unit.

• Always use the shoulder harness when using the
brush blade accessory.

• Keep the J-handle between the operator and cutting
attachment or blade at all times.

• NEVER cut with the cutting blade located over 30
inches (76 cm) or more above the ground level.

• Blade thrust may occur when the spinning blade
contacts an object that it does not immediately cut.
Blade thrust can be violent enough to cause the unit
and/or operator to be propelled in any direction , and
possibly lose control of the unit. Blade thrust can
occur without warning if the blade snags, stalls or
binds. This is more likely to occur in areas where it is
difficult to see the material being cut.

• For operation with the brush blade, do not cut
anything thicker than 1/2 inch or a violent kickback
could occur.

• Do not attempt to touch or stop the blade when it is
rotating.

•A coasting blade can cause injury while it continues to
spin after the engine is stopped or the throttle trigger
is released. Maintain proper control until the blade has
completely stopped rotating.

• Do not run the unit at high speed when not cutting.

• If you strike or become entangled with a foreign
object, stop the engine immediately and check for
damage. Have any damage repaired before attempting
further operations. Do not operate unit with a bent,
cracked or dull blade. Discard blades that are bent,
warped, cracked or broken.

• Do not sharpen the cutting blade. Sharpening the blade
can cause the blade tip to break off while in use. This can
result in severe personal injury. Replace the blade.

• Do not use the cutting blade for edging or as an
edger, severe personal injury to yourself or others can
occur. Use the cutting blade only for the purpose as
described in this manual.

•Stop the engine IMMEDIATELY if you feel excessive
vibration. Vibration is a sign of trouble. Inspect thoroughly
for loose nuts, bolts or damage before continuing. Repair
or replace affected parts as necessary.

After Use

• Clean cutting blades with a household cleaner to
remove any gum buildup. Oil the blade with machine
oil to prevent rust.

• Lock up and store the cutting blade in an appropriate area
to protect the blade from unauthorized use or damage.

Other Safety Warnings

• Never store a fueled unit inside a building where fumes
may reach an open flame or spark.

• Allow the engine to cool before storing or transporting.
Be sure to secure the unit while transporting.

• Store the unit in a dry area, locked up or up high to
prevent unauthorized use or damage, out of the reach
of children.

• Never douse or squirt the unit with water or any other
liquid. Keep handles dry, clean and free from debris.
Clean after each use, see Cleaning and Storage
instructions.

• Keep these instructions. Refer to them often and use
them to instruct other users. If you loan someone this
unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

6

SECTION 1b:SAFETY & INTERNATIONAL SYMBOLS

This operator's manual describes safety and international symbols and pictographs that may appear on this product.
Read the operator's manual for complete safety, assembly, operating and maintenance and repair information.

SYMBOL MEANING

• ON/OFF STOP CONTROL

OFF or STOP

• THROWN OBJECTS AND
ROTATING CUTTER CAN
CAUSE SEVERE INJURY

WARNING:

Do not operate without
the cutting attachment shield in place.
Keep away from the rotating cutting
attachment.

• HOT SURFACE WARNING

Do not touch a hot muffler, gear housing
or cylinder. You may get burned. These
parts get extremely hot from operation.
They remain hot for a short time after the
unit is turned off.

• SHARP BLADE

WARNING: Sharp blade on cutting

attachment shield. To prevent serious
injury, do not touch line cutting blade.

• BRUSHCUTTERS • REPLACE

DULL BLADE

Do not sharpen the cutting blade.
Sharpening the blade can cause the
blade tip to break off while in use. This
can result in severe personal injury.

•TRIMMER/BRUSHCUTTER
SAFETY

WARNING: Thrown objects and

rotating cutter can cause severe injury.
Keep bystanders, especially children
and pets, at least 50 feet (15 m) away
from the cutting area. The cutting
attachment shield must be used when
using the trimmer cutting attachment.

SYMBOL MEANING

• SAFETY ALERT SYMBOL

Indicates danger, warning or caution.
May be used in conjunction with other
symbols or pictographs.

•WARNING - READ
OPERATOR'S MANUAL

Read the operator’s manual(s) and follow
all warnings and safety instructions.
Failure to do so can result in serious injury
to the operator and/or bystanders.

• WEAR EYE AND HEARING
PROTECTION

WARNING:

Thrown objects and loud
noise can cause severe eye injury and
hearing loss. Wear eye protection
meeting ANSI Z87.1 standards and ear
protection when operating this unit.

Use a full face shield when needed.

•KEEP BYSTANDERS AWAY
WARNING:

Keep all bystanders,
especially children and pets, at least
50 feet (15 m) from the operating area.

• UNLEADED FUEL

Always use clean, fresh unleaded fuel.

• OIL

Refer to operator's manual for the
proper type of oil.

•ON/OFF STOP CONTROL

ON / START / RUN

7

SECTION 2: KNOW YOUR UNIT

Cutting Attachment

Shield

Fuel Cap

Throttle

Control

Throttle

Lock-Out

J-Handle

Cutting Attachment

Gear Housing

Shaft Grip

Primer Bulb

EZ-Start™

Lever

Air Filter/Muffler

Cover

Engine Stand

Spark Plug

On/Off Stop Control

Shaft

Housing

Starter Rope Grip

EZ-Link™

Blade Shield /

Shield Mount

Brush

Blade

Line Cutting Blade

Spark Plug

Muffler

Shoulder Strap Clip

Applications

As a trimmer:

• Cutting grass and light weeds

• Edging

• Decorative trimming around trees, fences, etc.
As a brushcutter:

• Cutting weeds and light bush of up to 1/2 inch
in diameter

Other optional accessories may be used with the
YM90. Refer to Operating the EZ-Link System for a
list of add-ons.

8

SECTION 3: ASSEMBLY INSTRUCTIONS

Installing and Adjusting the J-handle

1. Place the J-handle between the top and middle
clamp pieces. See Figure 1.

2. While holding the three pieces together, install the four
(4) screws through the top clamp and into middle clamp.

NOTE: The holes in the top and middle clamp will line up

only when assembled correctly.

3. Place the clamps and the J-handle over the shaft
housing and onto the bottom clamp.

4. Hold each hex nut in the bottom clamp recess with a
finger. Start screws with a large Phillips screwdriver.
Do not tighten until you make the handle adjustment.

5. Slide the J-handle in or out until the arrow/white line on the
decal touches the clamp assembly.

See Figure 2.

You

must first loosen the screws if the handle is pre-installed.

Figure 3

Figure 4

6. While holding the unit in the operating position,
arrange the J-handle to the location that provides you
the best grip. See Figure 3.

7. Tighten the clamp screws evenly, until the J-handle
is secure.

(4) Screws

Top Clamp

J-Handle

Middle Clamp

Bottom Clamp

Nuts

Decal

Figure 2

Figure 1

Support Fitting

Remove and Install the Cutting Attachment
Shield

Remove the cutting attachment shield when using the
unit as a brushcutter

Remove the cutting attachment shield from the shield
mount by removing the three (3) screws with a flat blade
screwdriver. See Figure 7. Store parts for future use.

Install the Harness

1. Push the strap through the center of the buckle.

2. Pull the strap over the cross bar and down through
the slot in the buckle. See Figure 4.

3. Put the harness on over head and onto shoulder.
Snap it on to the support fitting. See Figure 5.

4. Adjust length to fit the operator’s size. Pull tab to
lengthen, pull strap to shorten. See Figure 6.

WARNING: Always use the shoulder
harness when using the cutting blade to
avoid serious personal injury.

Figure 6

WARNING: The cutting attachment shield
should NOT be installed when operating the
unit with a blade. Remove the cutting
attachment shield before removing or
installing the blade.

Figure 5

9

Install the cutting attachment shield when using the unit
as a grass trimmer

Install the cutting attachment shield on the shield mount by
inserting the three (3) screws into the shield mount. Tighten
securely with a flat blade screwdriver. See Figure 7.

Remove the Cutting Attachment & Install
the Cutting Blade

NOTE: To make cutting blade removal and installation easier,

place the unit on the ground or on a work bench

.

Remove the Cutting Attachment Shield

See Remove and Install the Cutting Attachment Shield.

Remove the Cutting Attachment

1. Align the shaft bushing hole with the locking rod slot
and insert the locking rod into the shaft bushing hole.
See Figure 8.

(3) Screws

Cutting

Attachment

Shield

Shield Mount

Gear Housing

Cutting Attachment

Locking Rod

Slot

Locking Rod

Shaft Bushing Hole

Locking Rod Slot

Output Shaft

Bushing

Locking Rod

Output Shaft

2. Hold the locking rod in place by grasping it next to
the boom of the unit. See Figure 9.

3. While holding the locking rod, remove the cutting
attachment by turning it clockwise off of the output shaft.
See Figure 10.

Store the cutting attachment for future use.

NOTE: The blade retainer under the cutting attachment

will be used when installing the cutting blade.

Install the Cutting Blade

4. Place the cutting blade on the output shaft bushing.
See Figure 11.

Shield
Mount

Locking Rod

Cutting

Blade

Blade Retainer

Nut

Output Shaft

Bushing

Pilot Hole

SECTION 3: ASSEMBLY INSTRUCTIONS

WARNING: To avoid serious personal

injury, the cutting attachment shield MUST
be in place at all times while operating the
unit as a grass trimmer.

WARNING: The gear housing gets hot with

use. It can result in injury to the operator.
The housing remains hot for a short time
even after the unit is turned off. Do not
touch the gear housing until it has cooled.

WARNING:

To avoid serious personal
injury, always wear gloves while handling or
installing the blade.

Figure 10

Figure 9

Figure 8

Figure 7

Figure 11

10

SECTION 3: ASSEMBLY INSTRUCTIONS

Pilot Step

Remove the Cutting Blade & Install the
Cutting Attachment

Remove the Cutting Blade

1. Align the shaft bushing hole with the locking rod slot and
insert the locking rod into the bushing hole. See Figure 8

.

2. Hold the locking rod in place by grasping it next to
the boom of the unit. See Figure 14.

3. While holding the locking rod, loosen the nut on the
blade by turning it clockwise with a 5/8 inch closed­end or socket wrench. See Figure 14.

9. Remove the locking rod from the locking rod slot.

1/4-1/2 turn

Counterclockwise

6. Align the shaft bushing hole with the locking rod
slot and insert the locking rod into the bushing hole.
See Figure 8.

7. Put the blade retainer and nut on the output shaft.
Make sure that the blade is installed correctly.

8. Tighten nut counterclockwise against the blade while
holding the locking rod:

• If using a torque wrench and an 5/8 inch socket tighten

to: 325 - 335 in•lb, 27 - 28 ft.•lb, 37 - 38 N•m.

• Without a torque wrench, use a 5/8 inch closed-end or

socket wrench, turning the nut until the blade retainer is
snug against the shaft bushing. Make sure that the blade
is installed correctly, then rotate the nut an additional 1/4
to 1/2 turn counterclockwise. See Figure 13.

Cutting Attachment

Locking Rod

Clockwise

6. Remove the locking rod.

7. Install the cutting attachment shield. Refer to Remove

and Install the Cutting Attachment Shield.

Blade Retainer

Output Shaft

Bushing

5. Make sure that the cutting blade is centered on the
pilot step and sitting flat against the output shaft
bushing. See Figure 12.

4. Remove the nut, blade retainer and blade. Store the
nut and blade together for future use in a secure
place. Store out of children’s reach.

Install the Cutting Attachment

5.

Align the shaft bushing hole with the locking rod slot and
insert the locking rod into the shaft bushing hole.

See

Figure 8.

Place the blade retainer on the output shaft

with the flat surface against the output shaft bushing.

See

Figure 15.

Screw the cutting attachment

counterclockwise onto the output shaft. Tighten securely.

NOTE: The blade retainer must be installed on the output

shaft in the position shown for the cutting
attachment to work correctly.

WARNING:

To avoid serious personal
injury or damage to the unit, do not start or
operate this unit with the locking rod in the
locking rod slot.

WARNING: Do not sharpen the cutting blade.

Sharpening the blade can cause the blade tip
to break off while in use. This can result in
severe personal injury. Replace the blade.

WARNING: If the cutting blade is off-

center, the unit will vibrate and the blade
may fly off, causing possible serious
personal injury.

WARNING: To avoid serious personal
injury, the cutting head guard MUST be in
place at all times while operating the unit
as a trimmer.

WARNING: To avoid serious personal
injury, always wear gloves while handling or
installing the blade.

Figure 14

Figure 15

Figure 12

Figure 13

11

SECTION 4: OIL AND FUEL INFORMATION

WARNING: Gasoline is extremely
flammable. Ignited vapors may explode.
Always stop the engine and allow it to cool
before filling the fuel tank. Do not smoke
while filling the tank. Keep sparks and
open flames at a distance from the area.

WARNING: Remove fuel cap slowly to avoid
injury from fuel spray. Never operate the unit
without the fuel cap securely in place.

WARNING: Add fuel in a clean, well­ventilated outdoor area. Wipe up any
spilled fuel immediately. Avoid creating a
source of ignition for spilled fuel. Do not
start the engine until fuel vapors dissipate.

NOTE: Dispose of the old fuel/oil mix in accordance to

Federal, State and Local regulations.

Oil and Fuel Mixing Instructions

Old and/or improperly mixed fuel is the main reason for
improper unit performance. Be sure to use fresh, clean
unleaded fuel. Follow the instructions carefully for the
proper fuel/oil mixture.

Definition of Blended Fuels

Today's fuels are often a blend of gasoline and
oxygenates such as ethanol, methanol, or MTBE (ether).
Alcohol-blended fuel absorbs water. As little as 1%
water in the fuel can make fuel and oil separate. It forms
acids when stored. When using alcohol-blended fuel,
use fresh fuel (less than 60 days old).

Using Blended Fuels

If you choose to use a blended fuel, or its use is
unavoidable, follow recommended precautions:

• Always use fresh fuel mix per your operator's manual

• Always agitate the fuel mix before fueling the unit

• Drain the tank and run the engine dry before storing
the unit

Using Fuel Additives

The bottle of 2-cycle oil that came with your unit
contains a fuel additive which will help inhibit corrosion
and minimize the formation of gum deposits. It is
recommended that you use only our 2-cycle oil with this
unit.

If unavailable, use a good 2-cycle oil designed for air­cooled engines along with a fuel additive, such as
STA-BIL®Gas Stabilizer or an equivalent. Add 0.8 oz.
(23 ml.) of fuel additive per gallon of fuel according to the
instructions on the container. NEVER add fuel additives
directly to the unit's fuel tank.

CAUTION: For proper engine operation and
maximum reliability, pay strict attention to
the oil and fuel mixing instructions on the
2-cycle oil container. Using improperly mixed
fuel can severely damage the engine.

Thoroughly mix the proper ratio of 2-cycle engine oil with
unleaded gasoline in a separate fuel can. Use a 40:1 fuel/oil
ratio. Do not mix them directly in the engine fuel tank. See
the table below for specific gas and oil mixing ratios.

NOTE: One gallon (3.8 liters) of unleaded gasoline mixed

with one 3.2 oz. (95 ml.) bottle of 2-cycle oil
makes a 40:1 fuel/oil ratio.

+

UNLEADED GAS 2-CYCLE OIL

1 US. GALLON + 3.2 FL. OZ.

(3.8 LITERS) (95 ml)

1 LITER + 25 ml

MIXING RATIO - 40:1

12

SECTION 5: STARTING/STOPPING INSTRUCTIONS

WARNING: Operate this unit only in a well- ventilated
outdoor area. Carbon monoxide exhaust fumes can be
lethal in a confined area

.

WARNING: Avoid accidental starting. Make sure you are
in the starting position when pulling the starter rope.
See Figure 18. To avoid serious injury, the operator and
unit must be in a stable position while starting.

To avoid serious personal injury, ensure any Add-On
being used is installed correctly and secure before
starting unit.

Stopping Instructions

1. Release your hand from the throttle control.
See Figure 18. Allow the engine to cool
down by idling.

2. Push and hold the On/Off Stop Control in
the OFF (O) position until the engine stops
running. See Figure 16

On/Off Stop Control

Start/On (I)

Stop/Off (O)

Throttle Control

Starter Rope

Throttle Control

Primer

Bulb

EZ-Start™

Lever

Figure 18

Figure 17

Figure 16

Starting Instructions

IF... You are starting a warm engine, begin at step 4.

1. Mix gas with oil. Fill fuel tank with fuel/oil mixture.
See Oil and Fuel Mixing Instructions.

2. Make sure the On/Off Stop Control is in the ON (I)
position. See Figure 16.

3. Fully press and release the primer bulb 10 times,
slowly, until FUEL IS VISIBLE IN THE PRIMER
BULB. See Figure 17. If you can’t see fuel in the
bulb, press and release the bulb as many times as it
takes before you can see fuel in it.

4. Push the EZ-Start™ Lever to the left until it clicks and
locks into place. See Figure 17.

5. With the unit in the starting position, DO NOT
SQUEEZE THE THROTTLE CONTROL. See Figure

18. Pull the starter rope 5 times briskly, making sure the
EZ-Start™ lever is pushed to the left.

IF... The engine does not start, go back to step 3.
IF... The engine starts to run before the fifth pull, go to step 6.
IF... The outside temperature or engine temperature

exceeds 90º F and the engine fails to start after 5
pulls, fully squeeze the throttle control and pull the
starter rope briskly 3 to 8 more times. The engine
should start within these pulls.

NOTE: When starting, the EZ-Start™ Lever will automatically

click off when you squeeze the throttle control.

6. When the engine starts, squeeze the throttle control to
warm up the engine for 5 to 10 seconds. The EZ­Start™ Lever will click off automatically. See Figure 17.

IF

...

The engine stalls while squeezing the throttle, go
back to step 4.

IF... The engine stalls before you squeeze the throttle

control, hold the throttle control and pull the starter
rope until the trimmer starts.

Throttle Lock-Out

13

For edging (when using the line head cutting attachment
with EZ-Link™ models), lock the release button of the
cutting attachment into the 90° edging hole or the 180°
edging hole. See Figure 21.

Operating the EZ-Link™ System

The EZ-Link™ system enables the use of these optional
Add-Ons:

Blower/Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . BV720r

Cultivator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GC720r

Edger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r

Hedge Trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . HS720r

Snow Thrower . . . . . . . . . . . . . . . . . . . . . . . . . . . ST720r

Straight Shaft Trimmer . . . . . . . . . . . . . . . . . . . . SS725r

Tree Pruner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TP720r

Turbo Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . TB720r

Removing the Cutting Attachment or Add-Ons

1. Turn the knob counterclockwise to loosen. See Figure 19.

2. Press and hold the release button. See Figure 19.

3. While firmly holding the upper shaft housing, pull
the cutting attachment or add-on straight out of the
EZ-Link™ coupler. See Figure 20.

Installing the Cutting Attachment or Add-On

NOTE: Place the unit on the ground or on a work bench

to make add-on installation or removal easier.

1. Turn knob counterclockwise to loosen.

EZ-Link™ Coupler

Release Button

Guide Recess

Knob

Primary Hole

Upper Shaft Housing

EZ-Link™ Coupler

2. While firmly holding the add-on, push it straight into
the EZ-Link™ coupler. See Figure 20.

NOTE: Aligning the release button with the guide recess

will help installation. See Figure 19.

3. Turn the knob clockwise to tighten. See Figure 21.

Knob

Lower Shaft Housing

Release Button

90˚ Edging Hole

(Trimmer Only)

180˚ Edging Hole

(Trimmer Only)

CAUTION: Lock the release button in the
primary hole and securely tighten the knob
before operating this unit

SECTION 6: OPERATING INSTRUCTIONS

Figure 21

Figure 20

Figure 19

CAUTION:

The cutting attachment and add­ons with the EZ-Link™ system are to be used
in the primary hole unless stated otherwise in
the specific add-ons operator’s manual.
Using the wrong hole could lead to personal
injury or damage to the unit.

WARNING: Read and understand the
operator’s manual for each add-on prior to
operation.

WARNING: To avoid serious personal injury
and damage to the unit, shut off the unit
before removing or installing add-ons.

14

Holding the Trimmer

WARNING: Always wear eye, hearing, foot
and body protection to reduce the risk of
injury when operating this unit.

Before operating the unit, stand in the operating
position. See Figure 22. Check for the following:

• The operator is wearing eye protection and proper
clothing

• With a slightly-bent right arm, the operator’s right hand
is holding the shaft grip

• The operator’s left arm is straight, the left hand holding
the J-handle

• The unit is at waist level

•

The cutting attachment is parallel to the ground and
easily contacts the grass without the need to bend ove

r

Once you are in the operating position, hook the
shoulder strap to the unit.

Adjusting Trimming Line Length

The Bump Head™ cutting attachment allows you to release
trimming line without stopping the engine. To release more
line, lightly tap the cutting attachment on the ground while
operating the trimmer at high speed. See Figure 23.

NOTE: Always keep the trimming line fully extended.

Line release becomes more difficult when the
cutting line gets shorter.

Each time the head is bumped, about 1 inch (25.4 mm)
of trimming line releases. A blade in the cutting
attachment shield will cut the line to the proper length if
any excess line is released.

For best results, tap the bump knob on bare ground or
hard soil. If you attempt a line release in tall grass, the
engine may stall. Always keep the trimming line fully
extended. Line release becomes more difficult when the
cutting line gets shorter.

NOTE: Do not rest the bump knob on the ground while

the unit is running.

CAUTION: Do not remove or alter the line
cutting blade assembly. Excessive line
length may make the unit overheat.

Some line breakage will occur from:

• Entanglement with foreign matter

• Normal line fatigue

• An attempt to cut thick, stalky weeds

•

Forcing the line into objects such as walls or fence posts

Tips for Best Trimming Results

• For best trimming results, operate unit at full throttle.

• Keep the cutting attachment parallel to the ground.

• Do not force the cutting attachment. Allow the tip of
the line to do the cutting, especially along walls.
Cutting with more than the tip will reduce cutting
efficiency and may overload the engine.

• Cut grass over 8 inches (200 mm) tall by working
from top to bottom in small increments to avoid
premature line wear or engine drag.

• Cut from left to right whenever possible. Cutting to
the right improves the unit's cutting efficiency.
Clippings are thrown away from the operator.

• Slowly move the trimmer into and out of the cutting
area at the desired height. Move either in a forward­to-backward or side-to-side motion. Cutting shorter
lengths produces the best results.

• Trim only when grass and weeds are dry.

• The life of your cutting line is dependent upon:

• Following the trimming techniques

• What vegetation is being cut

• Where vegetation is cut

For example, the line will wear faster when trimming
against a foundation wall as opposed to trimming
around a tree.

SECTION 6: OPERATING INSTRUCTIONS

Figure 22

Figure 23

15

Decorative Trimming

Decorative trimming refers to the removal of vegetation
around trees, posts, fences and more.

Rotate the whole unit so that the cutting attachment is at
a 30° angle to the ground. See Figure 24.

Figure 24

Using the Cutting Blade

Before operating the unit with the cutting blade, stand in
the operating position. See Figure 25. Refer to Holding
the Trimmer.

Cutting Blade Operating Tips

To establish a rhythmic cutting procedure:

• Plant feet firmly, comfortably apart.

• Bring the engine to full throttle before entering the
material to be cut. At full throttle the blade has
maximum cutting power and is less likely to bind, stall
or cause blade thrust (which can result in serious
personal injury to the operator or others).

• Cut while swinging the upper part of your body from
left to right.

• Always release the throttle trigger and allow the engine
to return to idle speed when not cutting.

• When you are finished, always unsnap the unit from
the harness before taking off the harness.

• Swing the unit in the opposite direction as the blade
spins, which increases the cutting action.

• After the return swing, move forward to the next area
to be cut plant your feet again.

• The cutting blade is designed with a second cutting
edge. You can use it by removing the blade, turning it
upside down, and reinstalling it.

To reduce the chance of material wrapping around the
blade, follow these steps:

• Cut at full throttle

• Swing the unit into material to be cut from your left to
your right, see Figure 26

• Avoid the material just cut as you make the return swing

WARNING: Do not clear away any cut
material with the engine running or blade
turning. To avoid serious personal injury,
turn off the engine. Allow the blade to stop
before removing materials wrapped around
the blade shaft.

WARNING: Do not sharpen the cutting
blade. Sharpening the blade can cause the
blade tip to break off while in use. This can
result in severe personal injury to yourself
or others. Replace the blade.

WARNING: The blade continues to spin after
the engine is turned off. The coasting blade
can seriously cut you if accidentally touched.

WARNING: Blade thrust may occur when
the spinning blade contacts an object that
it does not immediately cut. Blade thrust
can be violent enough to cause the unit
and/or operator to be propelled in any
direction, and possibly lose control of the
unit. Blade thrust can occur without
warning if the blade snags, stalls or binds.
This is more likely to occur in areas where
it is difficult to see the material being cut.

WARNING: Do not use the cutting blade for
edging or as an edger. Severe personal
injury to yourself or others can result.

WARNING: Always wear eye, hearing, foot, body
protection and the shoulder strap to reduce the
risk of injury when operating this unit.

Figure 26

Figure 25

SECTION 6: OPERATING INSTRUCTIONS

16

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

WARNING: To prevent serious injury, never
perform maintenance or repairs with unit
running. Always service and repair a cool
unit. Disconnect the spark plug wire to
ensure that the unit cannot start.

Maintenance Schedule

Perform these required maintenance procedures at the
frequency stated in the table. These procedures should
also be a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require

special tools or skills. If you are unsure about
these procedures take your unit to any non-road
engine repair establishment, individual or
authorized service dealer.

NOTE: Maintenance, replacement, or repair of the

emission control devices and system may be
performed by any non-road engine repair
establishment, individual or authorized service
dealer.

In order to assure peak performance of your engine,
inspection of the engine exhaust port may be necessary
after 50 hours of operation. If you notice lost RPM, poor
performance or general lack of acceleration, this service
may be required. If you feel your engine is in need of this
inspection, refer service to any non-road engine repair
establishment, individual or authorized service dealer for
repair. DO NOT attempt to perform this process yourself
as engine damage may result from contaminants
involved in the cleaning process for the port.

FREQUENCY MAINTENANCE REQUIRED REFER TO

Before starting engine Fill fuel tank with fresh fuel Page 11
Every 10 hours Clean and re-oil air filter Page 18

Every 25 hours

Check and clean spark arrestor
Check spark plug condition and gap

Page 19
Page 20

Every 50 hours

Inspect exhaust port and spark arrestor screen for clogging or
obstruction to assure maximum performance levels

Page 19

Line Installation

This section covers both SplitLine™ and standard single
line installation.

Always use Genuine Factory Parts™ 0.095 in. (2.41 mm)
replacement line. Using line other than the specified may
make the engine overheat or fail.

WARNING: Never use metal-reinforced line,
wire, chain or rope. These can break off
and become dangerous projectiles.

There are two methods to replace the trimming line:

• Wind the inner reel with new line

• Install a prewound inner reel

Winding the Existing Inner Reel

1. Hold the outer spool with one hand and unscrew the
bump knob counterclockwise. See Figure 27. Inspect
the bolt inside the bump knob to make sure it moves
freely. Replace the bump knob if damaged.

2. Remove the inner reel from the outer spool. See
Figure 27.

3. Remove spring from the inner reel. See Figure 27.

4. Use a clean cloth to wipe the inner reel, spring, shaft,
and inner surface of the outer spool. See Figure 28.

Figure 27

Figure 28

Inner Reel

Spring

Outer Spool

Bump Knob

Bolt

17

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

5. Check the indexing teeth on the inner reel and outer
spool for wear. If necessary, remove burrs or replace
the reel and spool. See Figure 29.

NOTE: SplitLine™ can only be used with the inner reel

containing slotted holes. Single line can be used
on either type of inner reel. Use Figure 30 to
identify the inner reel you have.

Indexing Teeth

NOTE: Always use the correct line length when installing

trimming line on the unit. The line may not
release properly if the line is too long.

Single Line Installation

Go To Step 8 for SplitLine™ Installation

6. Cut approximately 25 feet (7.6 m) of new trimming
line, then loop it into two equal lengths. Insert each
end of the line through one of the two holes in the
inner reel. Pull the line through the inner reel so that
the loop is as small as possible. See Figure 31.

Slotted Holes

For Use with SplitLine™

or Single Line

For Use with

Single Line ONLY

7. Wind the lines in tight even layers onto the reel. See
Figure 32. Wind the line in the direction indicated on
the inner reel. Place your index finger between the
two lines to stop the lines from overlapping. Do not
overlap the ends of the line. Proceed to step 11.

SplitLine™ Installation

8. Cut approximately 12 feet (3.65 m) of new trimming
line. Insert one end of the line through one of the two
holes in the inner reel. Pull the line through the inner
reel until only about 4 inches is left out. See Figure 33.

9. Insert the end of the line into the open hole in the
inner reel and pull the line tight to make the loop as
small as possible. See Figure 33.

Loop

Loop

10. Before winding, split the line back about 6 inches.

11. Wind the line in tight even layers in the direction
indicated on the inner reel.

NOTE: Failure to wind the line in the direction indicated will

cause the cutting attachment to operate
incorrectly.

12. Insert the ends of the line into the two holding slots.
See Figure 34.

13. Insert the ends of the line through the eyelets in the
outer spool and place inner reel with spring inside
the outer spool. See Figure 35. Push the inner reel
and outer spool together. While holding the inner reel
and outer spool, grasp the ends and pull firmly to
release the line from the holding slots in the reel.

Figure 29

Figure 31

Figure 30

Figure 33

Figure 32

18

Air Filter Maintenance

Removing the Air Filter/Muffler Cover

WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to
cool before you clean or service it.

1. Remove the four (4) screws securing the air filter/
muffler cover. See Figure 36. Use a flat blade or T20
Torx bit screwdriver.

2. Pull the cover from the engine. Do not force.

Cleaning the Air Filter

WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to
cool before you clean it or perform any
maintenance.

Clean and re-oil the air filter every 10 hours of operation.
It is an important item to maintain. Failure to maintain the
air filter will VOID the warranty.

1. Remove air filter/muffler cover. See Removing the Air
Filter/Muffler Cover.

2. Turn cover over and look inside to locate the air filter.
Remove the air filter from inside the air filter/muffler
cover. See Figure 37.

3. Wash the filter in detergent and water. See Figure 38.
Rinse the filter thoroughly. Squeeze out excess
water. Allow it to dry completely.

4. Apply enough clean SAE 30 oil to lightly coat the
filter. See Figure 39.

5. Squeeze the filter to spread and remove excess oil.
See Figure 40.

Figure 36

Screws

Screws

EZ-Start™

Lever

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Holding Slots

Spring

NOTE: The spring must be assembled on the inner reel

before reassembling the cutting attachment.

14. Hold the inner reel in place and install the bump
knob by turning counterclockwise. Tighten securely.

Installing a Pre Wound Reel

1. Hold the outer spool with one hand and unscrew the
bump knob clockwise. See Figure 27. Inspect the
bolt inside the bump knob to make sure it moves
freely. Replace the bump knob if damaged.

2. Remove the old inner reel from the outer spool. See
Figure 27.

3. Remove the spring from the old inner reel. See
Figure 27.

4. Place the spring in the new inner reel.

NOTE: The spring must be assembled on the inner reel

before reassembling the cutting attachment.

5. Insert the ends of the line through the eyelets in the
outer spool. See Figure 35.

6. Place the new inner reel inside the outer spool. Push
the inner reel and outer spool together. While holding
the inner reel and outer spool, grasp the ends and
pull firmly to release the line from the holding slots in
the reel.

7. Hold the inner reel in place and install the bump
knob by turning counterclockwise. Tighten securely.

Replacement Parts

For replacement parts, refer to the Accessories /
Replacement Parts section.

Figure 35

Figure 34

19

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Air Filter

Inside Muffler

Cover

Figure 38Figure 37

Figure 40

Figure 39

6. Replace the air filter inside the air filter/muffler cover.
See Figure 37.

NOTE:

Operating the unit without the air filter and air
filter/muffler cover assembly, will VOID the warranty.

Reinstalling the Air Filter/Muffler Cover

1. Place the air filter/muffler cover over the back of the
carburetor and muffler. Align the screw holes.

2. Insert the four (4) screws into the holes in the air
filter/muffler cover and tighten. See Figure 36.

Do not over tighten.

Spark Arrestor Maintenance

1. Remove air filter/muffler cover. See Removing the Air
Filter/Muffler Cover.

2. Locate muffler front and the two (2) bolts securing it
to the engine. See Figure 41. Remove the two (2)
bolts using a flatblade screwdriver or 5/16-inch
socket or nut driver. Pull muffler off of the engine.

3. Turn muffler over to the back side and locate the
exhaust gasket. Remove the muffler gasket from the
muffler. See Figure 41.

NOTE: If the exhaust gasket is torn or damaged, replace

it with a new gasket before reassembling muffler.

4.

Using a small flatblade screwdriver, carefully pry up the
spark arrestor from the recessed hole. See Figure 42.
Remove the spark arrestor from the muffler.

Muffler - Front Side

Muffler - Back Side

Bolts

Exhaust

Gasket

Spark

Arrestor

Muffler - Back Side

Spark

Arrestor

Flat blade

Screwdriver

Spark Arrestor

5. Clean the spark arrestor with a wire brush. Replace it
if it is damaged or if it is impossible to clean
thoroughly. See Figure 42.

6. Reinstall the spark arrestor by pressing it into the
recessed hole on the muffler's back side. Make sure
it fits tightly against the muffler and is not raised up.

7. Place the exhaust gasket against muffler's back side.
Align the gasket bolt holes with the bolt holes in the
muffler. While holding exhaust gasket in place, insert
the bolts into the muffler's front side. See Figure 41.

8. Place the muffler (with the exhaust gasket in place
and bolts inserted), against the engine, aligning the
bolt holes. Tighten the bolts to secure the muffler to
the engine. If using a torque wrench torque to:

80-90 in.•lb. (9-10.2 N•m).

WARNING: If the muffler is not tightened
securely, it could fall off causing damage to
the unit and possible serious personal injury.

9. Reinstall the air filter/muffler cover.

Figure 42

Figure 41

20

Replacing the Spark Plug

Use a Champion RDJ7Y spark plug (or equivalent). The
correct air gap is 0.020 inch (0.5 mm). Remove the plug
after every 25 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Grasp the plug
wire firmly and pull it from the spark plug.

2. Clean around the spark plug. Remove the spark plug
from the cylinder head by turning a 5/8 in. socket
counterclockwise.

3. Replace cracked, fouled or dirty spark plug. Set the
air gap at 0.020 in. (0.5 mm) using a feeler gauge.
See Figure 44.

CAUTION: Do not sand blast, scrape or
clean electrodes. Grit in the engine could
damage the cylinder.

4. Install a correctly-gapped spark plug in the cylinder
head. Tighten by turning the 5/8 inch socket
clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m).
Do not over tighten.

0.020 in.
(0.5 mm)

Figure 44

Idle Speed Screw

Figure 43

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Carburetor Adjustment

The idle speed of the engine is adjustable through the air
filter/muffler cover. See Figure 43.

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make
carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason for
improper unit performance. Drain and refill the tank with
fresh, properly mixed fuel prior to making any
adjustments. Refer to Oil and Fuel Information.

Clean Air Filter

The condition of the air filter is important to the operation
of the unit. A dirty air filter will restrict air flow and change
the air/fuel mixture. This is often mistaken for an out of
adjustment carburetor. Check the condition of the air
filter before adjusting the idle speed screw. Refer to Air
Filter Maintenance.

Adjust Idle Speed

WARNING: The cutting attachment may
spin during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal
injury.

If, after checking the fuel mixture and cleaning the air
filter, the engine still will not idle, adjust the idle speed as
follows.

1. Start the engine and let it run at a high idle for a
minute to warm up. See Starting/Stopping
Instructions.

2. Release the throttle trigger and let the engine idle. If
the engine stops, insert a small Phillips or flat blade
screwdriver into the hole in the air filter/muffler cover.
See Figure 43. Turn the idle speed screw in,
clockwise, 1/8 of a turn at a time (as needed) until the
engine idles smoothly.

NOTE: The cutting attachment should not rotate when

the engine idles.

3. If the cutting attachment rotates when the engine idles,
turn the idle speed screw counterclockwise 1/8 of a
turn at a time (as needed), to reduce idle speed.

Checking the fuel mixture, cleaning the air filter, and
adjusting the idle speed should solve most engine
problems.

If this is not the case and the following are all true:

• The engine will not idle

• The engine hesitates or stalls on acceleration

• There is a loss of engine power

Have the carburetor adjusted by an authorized service
dealer.

WARNING: After turning the unit off, make
sure the cutting attachment has stopped
before setting the unit down. This helps
prevent serious personal injury.

21

SECTION 7: MAINTENANCE AND REPAIR INSTRUCTIONS

Accessories/Replacement Parts

2-Cycle Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147543

Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610311

Spark Arrestor . . . . . . . . . . . . . . . . . . . . . . . . . . .182747

Replacement Line . . . . . . . . . . . . . . . . . . . . . . . . 180120

Replacement Line Cartridge . . . . . . . . . . . . . . . . 147345

Inner Reel Spring . . . . . . . . . . . . . . . . . . . . . . . . 610636

Outer Spool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 683301

Inner Reel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147495

Bump Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180814

Fuel Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180000

Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . 682075

For specific replacement parts, refer to the parts list
located on the inside back cover of this manual.

Long Term Storage

If the unit will be stored for an extended time, use the
following storage procedure:

1. Drain all fuel from the fuel tank into a container with
the same 2-cycle fuel mixture. Do not use fuel that
has been stored for more than 60 days. Dispose of
the old fuel/oil mix in accordance to Federal, State,
and Local regulations.

2. Start the engine and allow it to run until it stalls. This
ensures that all fuel has been drained from the
carburetor.

3. Allow the engine to cool. Remove the spark plug and
put 1 oz. (30 ml) of any high quality motor oil or 2­cycle oil into the cylinder. Pull the starter rope slowly
to distribute the oil. Reinstall the spark plug.

NOTE: Remove the spark plug and drain all of the oil

from the cylinder before attempting to start the
trimmer after storage.

4. Thoroughly clean the unit and inspect for any loose
or damaged parts. Repair or replace damaged parts
and tighten loose screws, nuts or bolts. The unit is
ready for storage.

Cleaning

WARNING: To avoid serious personal injury,
always turn your trimmer off and allow it to
cool before you clean or service it.

Use a small brush to clean off the outside of the unit. Do
not use strong detergents. Household cleaners that
contain aromatic oils such as pine and lemon, and
solvents such as kerosene, can damage plastic housing
or handle. Wipe off any moisture with a soft cloth.

Storage

• Never store the unit with fuel in the tank where fumes
may reach an open flame or spark.

• Allow the engine to cool before storing.

• Store the unit locked up to prevent unauthorized use
or damage.

• Store the unit in a dry, well-ventilated area.

• Store the unit out of the reach of children.

Transporting

• Allow the engine to cool before transporting.

• Secure the unit while transporting.

• Drain fuel from unit.

• Tighten fuel cap before transporting.

22

SECTION 8: TROUBLESHOOTING GUIDE

If further assistance is required, contact your authorized service dealer

Trouble Possible Cause(s) Corrective Action

ENGINE WILL

NOT START

• Empty fuel tank

• Primer bulb wasn’t pressed enough

• Engine is flooded

• Old or improperly mixed fuel

• Fouled spark plug

• Plugged spark arrestor

• EZ-Start lever was not set

• Fill fuel tank with properly-mixed fuel

• Press primer bulb fully and slowly 10 times

• Hold throttle control and pull starter rope until it starts

• Drain gas tank and add fresh fuel mixture

• Replace or clean spark plug

• Clean or replace the spark arrestor

• Move lever to start

ENGINE WILL

NOT IDLE

• Air filter is plugged

• Old or improperly mixed fuel

• Improper carburetor adjustment

• Replace or clean the air filter

• Drain gas tank and add fresh fuel mixture

• Adjust according to the Carburetor Adjustment section

ENGINE WILL

NOT

ACCELERATE

• Old or improperly mixed fuel

• Improper carburetor adjustment

• Cutting attachment bound with grass

• Dirty air filter

• Plugged spark arrestor

• Drain gas tank and add fresh fuel mixture

• Take to an authorized service dealer for adjustment

• Stop the engine and clean the cutting attachment

• Clean or replace the air filter

• Clean or replace spark arrestor

ENGINE

LACKS

POWER OR

STALLS WHEN

CUTTING

• Old or improperly mixed fuel

• Improper carburetor adjustment

• Fouled spark plug

• Plugged spark arrestor

• Drain gas tank and add fresh fuel mixture

• Take to an authorized service dealer for adjustment

• Replace or clean spark plug

• Clean or replace the spark arrestor

CUTTING

ATTACHMENT

WILL NOT

ADVANCE LINE

• Cutting attachment bound with grass

• Cutting attachment out of line

• Inner reel bound up

• Cutting head is dirty

• Line welded

• Line twisted when refilled

• Not enough line is exposed

• Stop the engine and clean cutting attachment

• Refill with new line

• Replace the inner reel

• Clean inner reel and outer spool

• Disassemble, remove the welded section and rewind

• Disassemble and rewind the line

• Push the bump knob and pull out line until 4 inches
(102 mm) of line is outside of the cutting attachment

CUTTING LINE

ADVANCES

WILDLY

• Oil is in the cutting head • Clean the cutting head attachment

23

SECTION 9: SPECIFICATIONS

Engine*

Drive Shaft and Cutting Attachment*

*All specifications are based on the latest product information available at the time of printing. We reserve the right to
make changes at any time without notice.

Engine Type........................................................................................................................................... Air-Cooled, 2-Cycle

Stroke..................................................................................................................................................... 1.25 in. (31.75 mm)

Displacement.............................................................................................................................................. 1.9 cu in. (31 cc)

Clutch Type ......................................................................................................................................................... Centrifugal

Idle Speed RPM ....................................................................................................................................... 2,800 - 4,400 rpm

Operating RPM .................................................................................................................................................. 7,200+ rpm

Ignition Type.......................................................................................................................................................... Electronic

Ignition Switch...............................................................................................................................................

Rocker Switch

Spark Plug Gap........................................................................................................................................ 0.020 in. (0.5 mm)

Lubrication................................................................................................................................................... Fuel/Oil Mixture

Fuel/Oil Ratio.................................................................................................................................................................. 40:1

Carburetor....................................................................................................................................... Diaphragm, All-Position

Starter............................................................................................................................................................... Auto Rewind

Muffler..................................................................................................................................................... Baffled with Guard

Throttle............................................................................................................................................... Manual Spring Return

Fuel Tank Capacity........................................................................................................................................ 13 oz. (384 ml)

Drive Shaft Housing .......................................................................................................................... Steel Tube, EZ-Link™

Throttle Control................................................................................................................. Finger-Tip Trigger with Lock-Out

Approximate Unit Weight (No fuel, with cutting attachment, shield and J-handle)..................................... 14 lbs. (6.35 kg)

Cutting Mechanism................................................................................. 4-Tooth Cutting Blade, Dual String Cutting Head

Line Spool............................................................................................................................................. Bump Line Releaser

Line Spool Diameter............................................................................................................................. 4 inches (101.6 mm)

Trimming Line Diameter...................................................................................................................... 0.095 inch (2.41 mm)

Cutting Path Diameter, Cutting Attachment ......................................................................................... 18 inches (45.7 cm)

Cutting Path Diameter, Cutting Blade..................................................................................................... 8 inches (204 mm)

Shoulder Harness ................................................................................................................................... Single Quick-Snap

24

SECTION 9: NOTES

25

EPA Emission Control Warranty Statement

Your Warranty Rights and Obligations

The Environmental Protection Agency and MTD LLC (MTD) are pleased to explain the emission control system warranty
on your 2002 and later small off-road engine. New small off-road engines must be designed, built and equipped to meet
stringent anti-smog standards. Yard Man must warrant the emission control system on your small off-road engine for
the periods of time listed below provided there has been no abuse, neglect or improper maintenance of your small off­road engine.

Your emission control system may include parts such as the carburetor or fuel-injected system, the ignition system, and
catalytic converter. Also included may be hoses, belts, connectors and other emission-related assemblies.

Where a warrantable condition exists, Yard Man will repair your small off-road engine at no cost to you including
diagnosis, parts and labor.

The 2002 and later small off-road engines are warranted for two years. If any emission-related part on your engine is
defective, the part will be repaired or replaced my Yard Man.

Owners Warranty Responsibilities

• As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your
operator’s manual. Yard Man recommends that you retain all receipts covering maintenance on your small off-road
engine, but Yard Man cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance
of all scheduled maintenance.

• As the small off-road engine owner, you however should be aware that Yard Man may deny you warranty coverage if
your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved
modifications.

• You are responsible for presenting your small off-road engine to a Yard Man Authorized Service Center as soon as a
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, you should call 1-800-345-8746.

Manufacturer’s Warranty Coverage

• The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.

• The manufacturer warrants to the initial owner and each subsequent purchaser, that the engine is free from defects in
material and workmanship which cause the failure of a warranted part for a period of two years.

• Repair or replacement of warranted part will be performed at no charge to the owner at an Authorized Yard Man
Service Center. For the nearest location please contact Yard Man at: 1-800-345-8746.

• Any warranted part which is not scheduled for replacement, as required maintenance or which is scheduled for only
for regular inspection to the effect of “Repair or Replace as Necessary” is 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.

• The owner will not be charged for diagnostic labor which leads to the determination that a warranted part is defective,
if the diagnostic work is performed at an Authorized Yard Man Service Center.

• The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still
under warranty.

• Failures caused by abuse, neglect or improper maintenance are not covered under warranty.

• The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to
cover failures of warranted parts caused by the use of add-on or modified parts.

• In order to file a claim, go to your nearest Authorized Yard Man Service Center. Warranty services or repairs will be
provided at all Authorized Yard Man Service Centers.

• Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair
of emission related parts and will be provided without charge to the owner. Any replacement part that is equivalent in
performance or durability may be used in non-warranty maintenance or repair and will not reduce the warranty
obligations of the manufacturer

• The following components are included in the emission related warranty of the engine, air filter, carburetor, primer, fuel
lines, fuel pick up/ fuel filter, ignition module, spark plug and muffler.