Ryobi 1090r User manual

FOR QUESTIONS, CALL 1-800-345-8746 in U.S. or
1-800-265-6778 in CANADA
www.ryobi.com
IMPORTANT MANUAL DO NOT THROW AWAY
OPERATOR’S MANUAL
4-Cycle Gas Trimmer / Brushcutter
1090r

INTRODUCTION
2
TABLE OF CONTENTS
THANK YOU
Thank you for purchasing this quality product.
This modern outdoor power tool is designed to
provide many hours of useful service. You will find
it to be a great labor-saving device.
This operator’s manual provides you with easy-to-
understand operating instructions. Read the entire
manual and follow all of the instructions to keep your
new outdoor power tool in top operating condition.
The other manual that came with your power tool,
the parts manual, contains all of the information that
you need to order parts.
PRODUCT REFERENCES, ILLUSTRATIONS
AND SPECIFICATIONS
All information, illustrations and specifications
in this manual 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.
Copyright ©1998 Ryobi Outdoor Products, Inc.
All Rights Reserved.
Bump Head™is a trademark of Ryobi Outdoor
Products.
Click-Link®is a registered trademark of Ryobi
Outdoor Products.
I. California Emission Regulations . . . . . . . . 3
II. Rules for Safe Operation . . . . . . . . . . . 3-8
A. Important Safety Information . . . . . . 4-6
B. Safety and International Symbols . . . 6-7
C. Know Your Unit . . . . . . . . . . . . . . . . . . 8
III. Assembly Instructions . . . . . . . . . . . . 9-12
A. Adjusting the J-Handle . . . . . . . . . . . . 9
B. Installing the Harness . . . . . . . . . . . . . 9
C. Removing and Installing the
Cutting Attachment Shield . . . . . . . . . 10
D. Remove the Cutting Blade and
Install the Cutting Attachment . . . . . . 10
E. Removing the Cutting Attachment
and Installing the Cutting Blade . . . . . 11
IV. Oil and Fuel Information . . . . . . . . . . . . . 13
V. Starting/Stopping Instructions . . . . . . . . 14
VI. Operating Instructions . . . . . . . . . . . 15-17
A. Operating Click-Link System . . . . . . . 15
B. Adjusting Trimming Line Length . . . . . 16
C. Decorative Trimming . . . . . . . . . . . . . 16
D. Edging . . . . . . . . . . . . . . . . . . . . . . . . 16
E. Using the Cutting Blade . . . . . . . . . . . 16
VII. Maintenance and Repair Instructions .17-23
A. Maintenance Schedule . . . . . . . . . . . 17
B. Line Installation . . . . . . . . . . . . . . . . . .18
C. Installing a Prewound Reel . . . . . . . . . 19
D. Air Filter Maintenance . . . . . . . . . . . . 20
E. Carburetor Adjustment . . . . . . . . . . . 21
F. Checking the Oil Level . . . . . . . . . . . . 21
G. Changing the Oil . . . . . . . . . . . . . . . . 22
H. Checking/Adjusting Valve to
Rocker Arm Clearance . . . . . . . . . . . . 22
I. Replacing the Spark Plug . . . . . . . . . 23
VIII. Cleaning and Storage . . . . . . . . . . . . . . .24
A. Accessories/Replacement Parts . . . . 24
IX. Troubleshooting Chart . . . . . . . . . . . . . . 25
X. Specifications . . . . . . . . . . . . . . . . . . . . 26
XI. Warranty . . . . . . . . . . . . . . . . . . . . . . 27-28
CONTENTS OF CARTON
This unit should consist of the following:
•Model 1090r with J-Handle and
4-Tooth Cutting Blade with Cover
•String Guard and Hardware
•Bump Head ™ String Cutting Attachment
•Shoulder Harness
•Locking Rod
•3.4 oz. Bottle of 4-Cycle Oil (SAE 30)
•Operator's Manual and Parts Manual
•Product Registration Card
SERVICE INFORMATION
Service on this unit both within and after the
warranty period should be performed only by
an authorized and approved service dealer.
Dial 1-800-345-8746 in the United States
and 1-800-265-6778 in Canada to obtain
the listing of the authorized service dealer
nearest you.
Do not return the unit to the retailer.
NOTE: PROOF OF PURCHASE WILL BE
REQUIRED FOR WARRANTY SERVICE.
THIS PRODUCT IS COVERED BY ONE OR
MORE OF THE US PATENTS LISTED BELOW:
5,241,932; 5,176,116; 4,779,405; 4,651,422;
4,589,742; 4,505,040; 4,463,498; 4,356,605;
4,342,235; 4,223,441; 4,369,742; 5,267,536;
5,243,937; 5,263,454; 5,293,847; 5,558,057;
5,421,292; 5,463,809; 5,564,374; 5,738,062;
Des. 355,198;
OTHER PATENTS PENDING.
Make sure this manual is carefully read and
understood before starting or operating this
equipment.

3
CALIFORNIA EMISSION REGULATIONS
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 serious injury
to yourself or to others.
CAUTION: Failure to obey a safety
warning may result in property
damage or personal injury to
yourself or to others.
NOTE: Advises you of information or
instructions vital to the operation or
maintenance of the equipment.
SAFETY ALERT SYMBOL: Indicates
danger, warning, or caution. Special
attention is required in order to avoid
serious personal injury. May be used
in conjunction with other symbols or
pictographs.
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.
SYMBOL MEANING
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
#182153 Spark Arrestor Kit.
FOR QUESTIONS, CALL 1-800-345-8746 IN U.S. OR 1-800-265-6778 in CANADA
THE ENGINE EXHAUST FROM THIS
PRODUCT CONTAINS CHEMICALS
KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER, BIRTH DEFECTS
OR OTHER REPRODUCTIVE HARM.
WARNING
California Proposition 65 Warning:
RULES FOR SAFE OPERATION
This unit meets the 1995 to 1998 California emissions regulations for small off-road engines. These
units are identified by the label on the engine of your product. A typical identification label is shown.
To ensure that your unit continues to meet these regulations, refer to the following information and
instructions in this operator’s manual.

RULES FOR SAFE OPERATION
4
•Store fuel only in containers specifically
designed and approved for the storage of
such materials.
•Avoid creating a source of ignition for spilled
fuel. Do not start the engine until fuel vapors
dissipate.
•Always stop the engine and allow it to cool
before filling the fuel tank. Never remove the
cap of the fuel tank, 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.
•Mix and add fuel in a clean, well-ventilated
area outdoors where there are no sparks or
flames. Slowly remove the fuel cap only after
stopping engine. Do not smoke while fueling
or mixing fuel. Wipe up any spilled fuel from
the unit immediately.
•Move the unit at least 30 ft. (9.1 m) from the
fueling source and site before starting the
engine. Do not smoke, keep sparks and
open flames 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 kill. Operate this unit only in a well
ventilated area outdoors.
•Wear safety glasses or goggles that are
marked as meeting ANSI Z87.1-1989
standards, and ear/hearing protection when
operating this unit. Wear a face or dust mask
if the operation is dusty. Long sleeve shirts
are recommended.
•Wear heavy, long pants, boots and gloves.
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 as a
trimmer. 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 to provide
the best grip.
READ ALL INSTRUCTIONS
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.
•Children and teens under the age of 15 must
not use the unit, except for teens guided by
an adult.
•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 the
cutting attachment shield is properly
attached, and positioned as recommended.
Failure to so can result in personal injury to
the operator and bystanders, as well as
damage to the unit
•Use only 0.095 in (2.41 mm) diameter
genuine Ryobi replacement line. Never use
metal-reinforced line, wire, or rope, etc..
These can break off and become a
dangerous projectile.
•Be aware of the risk of injury to the head,
hands and feet.
•Clear the area to be cut before each use.
Remove all objects such as rocks, broken
glass, nails, wire, or string which can be
thrown or become entangled in the cutting
attachment. Clear the area of children,
bystanders, and pets. At a minimum, keep all
children, bystanders and pets outside a 50 ft.
(15 m.) radius; there still may be a risk to
bystanders from thrown objects. Bystanders
should be encouraged to wear eye
protection. If you are approached, stop the
engine and cutting attachment immediately.
•Squeeze the throttle control and check that it
returns automatically to the neutral position.
Make all adjustments or repairs before using
unit.
SAFETY WARNINGS FOR GAS
TRIMMERS
WARNING: Gasoline is highly flammable, and its
vapors can explode if ignited. Take the following
precautions:
•IMPORTANT SAFETY INFORMATION •

RULES FOR SAFE OPERATION
5
•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. Be in the starting
position whenever pulling the starter rope.
The operator and unit must be in a stable
position while starting. See
Starting/Stopping Instructions.
•Use the right tool. Only use this tool for the
purpose intended.
•Do not overreach. Always keep proper
footing and balance.
•Always hold the unit with both hands when
operating. Keep a firm grip on both the front
and rear handle 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 is
rotating.
•Do not touch the engine or muffler. These
parts get extremely hot from operation. When
turned off they remain hot for a
short time.
•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 and switch the engine to off for
maintenance, repair, or for changing the
cutting attachment or other attachments.
•Use only genuine Ryobi replacement parts
when servicing this unit. These parts are
available from your authorized service
dealer. Do not use parts, accessories or
attachments not authorized by Ryobi for this
unit. Doing so could lead to serious injury to
the user, or damage to the unit, and void
your warranty.
•Keep unit clean of vegetation and other
materials. They may become lodged
between the cutting attachment and shield.
•To reduce fire hazard, replace faulty muffler
and spark arrestor, keep the engine and
muffler free from grass, leaves, excessive
grease or carbon build up.
WHILE OPERATING WITH
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 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.
•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.

RULES FOR SAFE OPERATION
6
SAFETY AND 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.
•READ OPERATOR'S MANUAL
Failure to follow operating instructions and safety precautions
in operator's manual can result in serious injury. Read
operator's manual before starting or operating this unit.
SYMBOL MEANING
•SAFETY ALERT SYMBOL
Indicates danger, warning, or caution. May be used in
conjunction with other symbols or pictographs.
•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-
1989 standards and ear protection when operating this unit.
•FOR SERVICE INFORMATION, CALL:
USA: 1-800-345-8746
CANADA: 1-800-265-6778
•PRIMER BULB
Push primer bulb, fully and slowly, 5 to 7 times.
•KEEP BYSTANDERS AWAY
WARNING: Keep all bystanders, especially children and pets,
at least 50 feet (15 m) away from the trimming area.
•UNLEADED FUEL
Always use clean, fresh unleaded fuel.
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 the unit, with fuel in the tank,
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 locked up and dry, or high
and dry place to prevent unauthorized use or
damage. Keep 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

RULES FOR SAFE OPERATION
7
•THROWN OBJECTS AND ROTATING CUTTER CAN
CAUSE SEVERE INJURY
WARNING: Do not operate unit without string guard in place.
Keep away from rotating cutter.
•IGNITION SWITCH
ON / START / RUN
•IGNITION SWITCH
OFF or STOP
•HOT SURFACE WARNING
Do not touch a hot muffler, gear box or cylinder. You may get
burned. These parts get extremely hot from operation and
remain hot for a short time after the unit is turned off.
SYMBOL MEANING
•CHOKE CONTROL
ASTARTposition.
B RUN position.
•INDICATES OIL
Refer to operator's manual for the proper type of oil.
•SHARP BLADE
WARNING: Sharp blade on string guard. To prevent serious
injury, do not touch line cutting blade.
•BRUSHCUTTERS Replace dull blade.
Do not sharpen the brush 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. Plastic
string guard must be used when using the string cutting head.

RULES FOR SAFE OPERATION
8
KNOW YOUR UNIT
Cutting
Attachment
Shield
Fuel Cap
Throttle
Control
J-Handle
Shoulder
Harness
Line Cutting
Blade
Cutting
Attachment
Handgrip
APPLICATION
Use the string head for cutting light grass and
weeds. Also for decorative trimming around
trees, fences, etc.
Use the 4-tooth brush blade for weeds and light
brush of up to 1/2 inch in diameter.
Other attachments may be used with this unit.
See the list of attachments on page 15.
Primer
Bulb
Choke
Lever
Gear
Housing
Blade
Guard
4-Tooth
Blade
with Cover
Oil Fill
Plug /
Dipstick
Air Filter
Cover
Spark Plug
On/Off Stop
Control
Click-Link
Shaft
Housing
Starter Rope
Grip

ASSEMBLY INSTRUCTIONS
9
Decal
Screws
ADJUSTING THE J-HANDLE
The J-handle is assembled on this model not
in the correct position. Use the following
instructions to adjust the J-handle to the
correct position.
1. Loosen the four (4) mounting screws
on the J-handle.
2. Slide the J-handle until the arrow/bar on
the decal is flush to the edge of the clamp
assembly (Fig. 1).
3. While holding the unit in the operating
position (Fig. 2), adjust (rotate) the handle
forward and back to a position that
provides you the best grip.
4. Tighten the mounting screws.
Fig. 1
Fig. 3
Fig. 2
INSTALLING THE HARNESS
WARNING: Always use the shoulder
harness when using the cutting
blade to avoid serious personal
injury.
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 (Fig. 3).
3. Snap it on to the support fitting (Fig. 4).
4. Adjust length to fit the operator’s size. Pull
tab to lengthen, pull strap to shorten (Fig 5).
Fig. 4
Fig. 5

ASSEMBLY INSTRUCTIONS
10
Fig. 6
Fig. 7
Fig. 8
String Guard
Screws
Install the cutting attachment shield
when using the unit as a grass
trimmer.
WARNING: To avoid serious
personal injury, the cutting
attachment shield SHALL be in
place at all times while operating 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 (Fig. 6).
REMOVE THE CUTTING BLADE AND
INSTALL THE CUTTING ATTACHMENT
Remove the Cutting Blade
WARNING: To avoid serious
personal injury, always wear gloves
while handling or installing the blade.
REMOVING AND INSTALLING
CUTTING ATTACHMENT SHIELD
Remove the cutting attachment shield
when using the unit as a brushcutter.
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.
Remove the cutting attachment shield from the
shield mount by removing the three (3) screws
with a flat blade screwdriver (Fig. 6). Store parts
for future use.
4. Remove the nut, blade retainer, and blade.
Store the nut and blade together for future
use in a secure place. Store out of reach of
children.
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. (Fig. 7). Put the blade
retainer onto the output shaft. Screw the
cutting attachment counterclockwise onto
the output shaft. Tighten securely (Fig. 9).
NOTE: The blade retainer must be installed on
the output shaft for the cutting
attachment to work correctly.
clockwise
NOTE: To make removing or installing the
cutting blade or cutting attachment
easier, place the unit on the ground or
on a work bench.
1. Install the cutting blade cover. Pull the cover
around the blade and click the plastic lock.
2. Align the shaft bushing hole with the locking
rod slot and insert the locking rod into the
bushing hole (Fig. 7).
3. While holding the locking rod, loosen the nut
on the blade by turning it clockwise with a
5/8 inch closed-end or socket wrench
(Fig. 8).
Shaft Bushing
Hole
Locking
Rod Slot
Output Shaft
Bushing
Locking Rod
Output Shaft

ASSEMBLY INSTRUCTIONS
11
Fig. 9 Fig. 10
Fig. 11
Fig. 12
Cutting Attachment
Locking Rod
6. Remove the locking rod.
7. Install the cutting attachment shield. See
Removing and Installing Cutting
Attachment Shield, Pg. 10.
WARNING: To avoid serious
personal injury, the cutting
attachment shield SHALL be in
place at all times while operating the
unit as a grass trimmer.
REMOVING THE CUTTING
ATTACHMENT AND INSTALLING THE
CUTTING BLADE
NOTE: To make removing or installing the
cutting blade or cutting attachment
easier, place the unit on the ground or
on a work bench.
Remove the Cutting Attachment
Shield
See Removing and Installing Cutting
Attachment Shield, Pg. 10.
Remove the Cutting Attachment
WARNING: The gear housing gets
hot with use and can result in injury
to the operator. When the unit is
turned off it remains hot for a short
time. Do not touch the gear housing
until it has cooled.
1. Align the shaft bushing hole with the locking
rod slot and insert the locking rod into the
shaft bushing hole (Fig. 7).
2. While holding the locking rod, remove the
cutting attachment by turning it clockwise off
of the output shaft (Fig. 10). Store the cutting
attachment for future use.
Blade Retainer
4. Center the cutting blade on the pilot step of
the output shaft bushing (Fig. 12).
Shield Mount
Install the Cutting Blade
WARNING: To avoid serious
personal injury, always wear gloves
while handling or installing the blade.
3. Place the cutting blade on the output shaft
(Fig. 11).
Cutting Attachment
Locking Rod
Cutting
Blade
Blade Retainer Nut
Locking Rod Slot
Blade Cover
Locking Rod
Output Shaft
Pilot Hole
Pilot Step
Output Shaft
Bushing
Output Shaft

ASSEMBLY INSTRUCTIONS
12
Fig. 13
Fig. 15
Fig. 14
5. Make sure that the cutting blade is centered
on the pilot step and sitting flat against the
output shaft bushing (Fig. 13).
WARNING: If the cutting blade is
off-center, the unit will vibrate, and
the blade may fly off, which can
cause serious personal injury.
6. Align the shaft bushing hole with the locking
rod slot and insert the locking rod into the
bushing hole (Fig. 7, Pg. 10).
7. Put the blade retainer and nut on the output
shaft. Make sure that the blade is installed
correctly.
8. Tighten counterclockwise against the blade
while holding the locking rod (Fig. 14).
9. Remove the locking rod from the locking rod
slot.
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.
10.Remove the cutting blade cover by
un-snapping the plastic lock on the cover
and pulling it from the blade. Store the cover
for future use.
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.
NOTE: A replacement cutting blade,
Part # 145873 can be purchased from
you local authorized dealer.
1/4-1/2 turn
Counterclockwise
Counterclockwise
Pilot Step
•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 1/4-1/2 turn counterclockwise
(Fig. 15).

OIL AND FUEL INFORMATION
13
RECOMMENDED FUEL TYPE
WARNING: Gasoline is extremely
flammable and its vapors can
explode if they are ignited. To avoid
serious personal injury, 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 away from
the area.
WARNING: Pressure can build up
in the fuel tank. Loosen the fuel
tank cap slowly to relieve any
pressure in the tank.
Old fuel is usually the main reason for the unit
not running properly. Be sure to use fresh,
clean, unleaded fuel.
NOTE: Alcohol-blended fuel absorbs moisture
(water). As little as 1% moisture in the
fuel can cause it to separate and form
acids when stored. If this type of fuel
must be used, use fresh fuel (less than
60 days old).
DEFINITION OF BLENDED FUELS
Today's fuels are often a blend of gasoline and
one or more oxygenates such as ethanol,
methanol or MTBE (ether).
USE OF BLENDED FUELS
If you choose to use a blended fuel or its use is
unavoidable, the following precautions are
recommended.
1. Always use fresh unleaded fuel per your
operator's manual.
2. Use the special additive STA-BIL®or
an equivalent.
3. Always agitate the fuel mix before fueling
the unit.
4. Drain the tank and run the engine dry before
storing the unit.
USE OF FUEL ADDITIVES
The use of fuel additive, such as STA-BIL®Gas
Stabilizer or an equivalent, will inhibit corrosion
and minimize the formation of gum deposits.
Add 0.8 oz (23 ml) per gallon of fuel per
instructions on container. NEVER add fuel
additives directly to the unit's fuel tank. Using
a fuel additive can keep fuel fresh for up to
six (6) months.
RECOMMENDED OIL TYPE
Using the proper type and weight of oil in the
crankcase is extremely important. Check the oil
before each use and change the oil regularly.
Failure to use the correct oil, or using dirty oil,
can cause premature engine wear and failure.
Use a high-quality SAE 30 weight oil of
API (American Petroleum Institute) service class
SG, SF, SH.
ADDING OIL TO CRANKCASE –
INITIAL USE
Your unit is supplied with one bottle of oil,
3.4 fluid oz (100 ml) SAE 30 SF, SG, SH (Fig. 16).
1. Open the bottle of oil.
2. Install the funnel spout.
3. Place the unit on a flat level surface.
4. Remove the oil plug / dipstick from the
crankcase. Pour the entire bottle of oil into
the crankcase (Fig. 17).
NOTE: Save the bottle and spout for future
use.
NOTE: Never add oil to the fuel or fuel tank.
5. Wipe up any oil that may have spilled and
reinstall the oil fill plug / dipstick.
The importance of checking and maintaining
the proper oil level in the crankcase cannot be
overemphasized. Check oil before each use
and change as needed as shown in
Maintenance section.
Fig. 16
Fig. 17
Funnel Spout

STARTING/STOPPING INSTRUCTIONS
14
STARTING/STOPPING
WARNING: Operate this unit only
in a well-ventilated area outdoors.
Carbon monoxide exhaust fumes can
be lethal in a confined area.
WARNING: Avoid accidental starting.
Be in the starting position whenever
pulling the starting rope. To avoid
serious personal injury, the operator
and unit must be in a stable position
while starting.
NOTE: Keep the throttle control depressed at
all times until the engine is warmed up.
1. Check oil level in crankcase. See Checking
the Oil Level in Maintenance section.
2. Fill the fuel tank with fresh, clean, unleaded
fuel (see page 13).
3. Put the On/Off Stop Control in the START [I]
position (Fig. 18).
4. Fully press and release the primer bulb slowly
5 to 7 times. Fuel should be visible in the
bulb (Fig. 19).
5. Place the choke lever in the START (A)
position (Fig. 19).
6. With the unit in the starting position, squeeze
the throttle control and pull the starter rope
briskly until the engine sounds like it wants to
run (normally 2 to 5 pulls) (Fig. 20).
7. Place the choke lever in the RUN (B) position
(Fig. 19). The lever should snap up into place.
8. Pull the starter rope briskly 1 to 3 times to
start the engine (Fig. 20).
9. If the engine does not start, repeat steps
5 through 8.
NOTE: If the engine floods while attempting
to start the unit, place the choke lever
in the RUN (B) position, squeeze the
throttle control, and pull the starter
rope briskly. The engine should start
within three (3) to eight (8) pulls.
10.Keep throttle control depressed for 5 to 10
seconds to warm up engine.
NOTE: Choking is not required when starting a
warm engine. Start a warm engine
with the On/Off Stop Control in the
START position and the choke lever
in the RUN (B) position.
11.To stop the engine, put the On/Off Stop
Control in the STOP [O]position (Fig. 18).
Fig. 19
Fig. 18
Fig. 20
Starter
Rope
Throttle
Control
On/Off Stop
Control
Primer
Bulb
Run
(B)
Start
(A)
Choke
Lever

OPERATING INSTRUCTIONS
15
NOTE: Aligning the release button with guide
recess will help installation (Fig. 21).
2. Basic trimming or using other Ryobi
attachments - Locate and lock the release
button into the primary hole in the Click-Link
(Fig. 22).
3. Edging with the trimmer head attachment
-Locate and lock the release button into the
90˚edging hole or 180˚edging hole in the
Click-Link (Fig. 23).
CAUTION: Make sure the release
button is locked in the primary hole
and knob is securely tightened
before operating this unit.
CAUTION: All attachments are
designed to be used in the primary
hole unless otherwise indicated in
the attachment’s operator’s manual.
If the incorrect hole is used, it
could result in injury, or damage
to the unit.
4. Tighten the knob securely clockwise before
using the unit (Fig. 23).
OPERATING THE CLICK-LINK®
SYSTEM
This unit is equipped with a Click-Link®System,
which enables optional attachments to be
installed on the unit. The optional attachments
are:
Blower/Vacuum . . . . . . . . . . . . . . . . . . BV720r
Cultivator . . . . . . . . . . . . . . . . . . . . . . . GC720r
Edger . . . . . . . . . . . . . . . . . . . . . . . . . . LE720r
Hedge Trimmer . . . . . . . . . . . . . . . . . . HS720r
Snow Thrower . . . . . . . . . . . . . . . . . . . ST720r
Straight Shaft Trimmer . . . . . . . . . . . . . SS725r
Sweeper/Blower . . . . . . . . . . . . . . . . . . SB720r
Tree Pruner . . . . . . . . . . . . . . . . . . . . . . TP720r
Turbo Blower . . . . . . . . . . . . . . . . . . . . TB720r
WARNING: To avoid serious
personal injury, shut off the unit
prior to removing or installing
any attachments.
Removing the Lower (Attachment) Boom
NOTE: To make removing the boom easier,
place the unit on the ground or on
a workbench.
1. Loosen the knob counterclockwise (Fig. 21).
2. Press and hold the release button in (Fig. 21).
3. While firmly holding the upper boom, pull
the lower boom straight out of the Click-Link
(Fig. 22).
Click-Link
Click-Link
Release Button
Guide
Recess
Knob
Primary Hole
Upper
Boom
Lower
Boom
Release
Button
90˚
Edging
Hole
Knob
180˚
Edging
Hole
Fig. 21
Fig. 22
Fig. 23
If your unit is not assembled, or you
have more than one attachment, use
the following instructions:
Installing the Lower (Attachment) Boom
1. Remove the hanger from the lower
(attachment) boom. Hold the release button
in while pushing the lower (attachment)
boom into the Click-Link (Fig. 22).

OPERATING INSTRUCTIONS
16
WARNING: The blade continues to
spin after the engine is turned off.
The coasting blade can seriously cut
you if accidentally touched.
Do not clear away cut material with
the engine running or blade turning.
To avoid serious personal injury, turn
off engine and allow the blade to
stop before removing materials
wrapped around the blade shaft.
Each time the head is bumped, about 1 inch
(25.4 mm) of trimming line is released. A blade
in the string guard will cut the line to the proper
length if excess line is released.
CAUTION: Do not remove or alter
the line cutting blade assembly.
Excessive line length will cause
clutch to over-heat and may result
in serious personal injury.
For best results, tap the head on bare ground
or hard soil. If line release is attempted in tall
grass, the engine may stall.
DECORATIVE TRIMMING
Decorative trimming is accomplished by
removing all vegetation around trees, posts,
fences, etc.
Rotate the entire unit so that the cutting head
is at a 30°angle to the ground (Fig. 25).
ADJUSTING TRIMMING LINE LENGTH
Your unit is equipped with a string head that
allows the operator to release more trimming
line without stopping the engine. To release
additional line, lightly tap the string head on
the ground (Fig. 24) while operating the unit at
high speed.
NOTE: Always keep the trimming line fully
extended. Line release becomes
more difficult as cutting line
becomes shorter.
EDGING
For edging with the trimming head attachment,
locate and lock the release button into the
90°edging hole or 180°edging hole in the
Click-Link system (Fig. 23, Pg. 15).
USING THE CUTTING BLADE
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.
WARNING: Always wear eye,
hearing, foot, and body protection
to reduce the risk of injury when
operating this unit.
Always use the proper stance for using the
brush blade (Fig. 26).
Fig. 24
Fig. 25
Fig. 26

OPERATING INSTRUCTIONS
17
MAINTENANCE AND REPAIR INSTRUCTIONS
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.
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. The blade
has maximum cutting power at full throttle
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 right to left.
•Always release the throttle trigger and allow
the engine to return to idle speed when not
cutting. Swing the unit in the same direction
as the blade spins, which increases the
cutting action.
•Move forward to the next area to be cut after
the return swing and plant feet again.
•The brush blade is designed with a second
set of teeth, which can be used 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 right to your left (Fig. 27).
•Avoid the material just cut as you make the
return swing.
Fig. 27
MAINTENANCE SCHEDULE
These required maintenance procedures should
be performed at the frequency stated in the
table. They should also be included as part of
any seasonal tune-up.
For a new engine, change the oil after the first
10 hours of operation. See Changing the Oil
(Pg. 22).
WARNING: To prevent serious
personal injury, never perform any
type of maintenance or repairs with
the unit running or while it is hot.
Allow the unit to cool down.
Disconnect spark plug wire to
make sure the unit will not start.
FREQUENCY MAINTENANCE REQUIRED REFER TO:
Daily or Before Check oil level. Page 21
Starting Engine Fill fuel tank with correct type of fuel. Page 13
Every 10 Hours Clean and re-oil air filter. Page 20
Every 25 Hours Change oil. Page 22
Every 50 Hours Check spark plug condition and gap. Page 23
Every 50 Hours Check rocker arm to valve clearance Page 22
and adjust as required

MAINTENANCE AND REPAIR INSTRUCTIONS
18
Fig. 28
Fig. 29
Fig. 30
Fig. 31
LINE INSTALLATION
The trimming line may be replaced by two
different methods - rewinding the existing reel or
installing a prewound reel.
Rewinding the Existing Reel
To rewind the existing reel you must:
1. Check for the correct line size.
2. Remove the existing reel and spring.
3. Wind the existing reel with the new line.
4. Reinstall the existing reel and spring.
The Correct Line to Use
WARNING: Always use genuine
Ryobi replacement line. Do not use
metal-reinforced line.
It is very important to use the correct size line.
Use line with a diameter of 0.095 in (2.41 mm).
The motor may overheat and fail if you use a
larger line.
Removing the Existing Reel
1. Hold the outer spool with one hand and
unscrew the Bump Knob™clockwise
(Fig. 28). Inspect the captured bolt inside
the Bump Knob to make sure it moves freely.
Replace the Bump Knob if it is damaged.
2. Remove the inner reel and spring (Fig. 28).
3. Use a clean cloth to clean the inner surface
of the outer spool (Fig. 29).
NOTE: Always clean the inner reel, outer
spool, and shaft before reassembling
the cutting head.
4. Check the indexing teeth on the inner
reel and outer spool for wear (Fig. 30).
If necessary, remove burrs or replace
the reel and spool.
Winding the Existing Reel
1. Take approximately 30 feet (9 m) of new
trimming line, loop it into two equal lengths.
Insert each end of the line through one of the
two holes in the inner reel (Fig. 31).
Pull the line so that the loop is as small
as possible.
Spring
Loop
Inner Reel
Bump Knob

MAINTENANCE AND REPAIR INSTRUCTIONS
19
2. Wind the lines, in even and tight layers,
onto the reel (Fig. 32). Wind the line in the
direction indicated on the inner reel. Be sure
not to overlap the two ends of the line.
NOTE: Place your index finger between
the two lines to stop the lines from
overlapping.
NOTE: Failure to wind the line in the direction
indicated will cause the cutting head
to operate incorrectly.
3. Insert the ends of the line into the two
holding slots (Fig. 33).
Reinstalling the Reel
1. Insert the ends of the line through the eyelets
in the outer spool and place inner reel inside
the outer spool (Fig. 34). Then grasp the
ends and pull firmly to release the line from
the holding slots in the spool.
NOTE: The spring must be assembled on
the inner reel before reassembling
the string head.
2. Hold the inner reel in place and install
the Bump Knob in the counterclockwise
direction (see Fig. 28). Line installation
is now complete.
INSTALLING PREWOUND REEL
1. Follow the instructions in The Correct Line
to Use.
2. Follow the instructions in Removing the
Existing Reel.
3. Follow the instructions in Reinstalling the
Reel.
Fig. 32
Fig. 34
Fig. 33

MAINTENANCE AND REPAIR INSTRUCTIONS
20
Fig. 36
Fig. 35
4. Wash the filter in detergent and water
(Fig. 36). Rinse the filter thoroughly
and allow it to dry.
AIR FILTER MAINTENANCE
Clean and re-oil the air filter every 10 hours
of operation. Your unit’s air filter is one of the
most important areas to maintain. If it is not
maintained, you will void the warranty. Before
cleaning, make sure the unit is turned off.
1. Place the choke lever in the RUN (B)
position (Fig. 35).
2. Remove the carburetor/air filter cover by
pulling up the two tabs on the bottom back
of the cover, then pull out and up (Fig. 35).
3. Remove the air filter (Fig. 35).
Fig. 37
Fig. 38
Fig. 39
5. Apply enough clean SAE 30 motor oil to
lightly coat the filter (Fig. 37).
6. Squeeze the filter to spread and remove
excess oil (Fig. 38).
7. Reinstall the filter (Fig.35).
8. Reinstall the air filter cover by positioning the
notch on top of the air filter cover onto the
tab at the top of the back plate. Be sure the
choke lever in the RUN (B) position (Fig. 39).
9. Using two fingers on either side of the air
filter cover and back plate, squeeze together
until the cover snaps into place (Fig. 39).
NOTE: If the unit is operated without the
carburetor/air filter cover assembled,
you will VOID the warranty.
Air Filter Choke Lever
Carburetor/
Air Filter
Cover
Tab Slots
Back Plate
Carburetor/
Air Filter
Cover
Tab Slots