Y765
Operator’s Manual
2-Cycle Gasoline
Trimmer
Model Y765
IMPORTANT: READ SAFETY RULES AND INSTRUCTIONS CAREFULLY
P/N 769-01536 (1/05)
2
INTRODUCTION
Copy the serial number
here:
THANK YOU
Thank you for buying this quality product. This modern
outdoor power tool will 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-tounderstand operating instructions. Read the whole
manual and follow all the instructions to keep your new
outdoor power tool in top operating condition.
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© 2005 MTD SOUTHWEST INC, All Rights
Reserved.
Bump Head™ is a trademark of MTD SOUTHWEST INC.
SplitLine™ is a trademark of MTD SOUTHWEST INC.
SERVICE INFORMATION
Service on this unit both within and after the warranty
period should be performed only by an authorized and
approved service dealer.
For service call 1-800-345-8746 in the United States, or
1-800-668-1238 in Canada to obtain a list of authorized
service dealers near you. For more details about your
unit, visit our website at www.yardmachines.com.
DO NOT RETURN THE UNIT TO THE RETAILER.
PROOF OF PURCHASE WILL BE REQUIRED FOR
WARRANTY SERVICE.
Before beginning, locate the unit’s model plate. It lists
the model and serial numbers of your unit. Refer to the
sample plate below and copy the information for future
reference.
Make sure you carefully read and understand this manual
before starting or operating this equipment.
THIS PRODUCT IS COVERED BY ONE OR MORE U.S.
PATENTS. OTHER PATENTS PENDING.
TABLE OF CONTENTS
Service Information . . . . . . . . . . . . . . . . . . . . . . . . .2
Rules for Safe Operation . . . . . . . . . . . . . . . . . . . . .3
Know Your Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . .7
Oil and Fuel Information . . . . . . . . . . . . . . . . . . . . . .8
Starting/Stopping Instructions . . . . . . . . . . . . . . . . .9
Operating Instructions . . . . . . . . . . . . . . . . . . . . . .10
Maintenance and Repair Instructions . . . . . . . . . . .11
Cleaning and Storage . . . . . . . . . . . . . . . . . . . . . . .16
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . .17
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Warranty Information . . . . . . . . . . . . . . . . . . . . . . .20
Parts List . . . . . . . . . . . . . . . . . . . .Inside Back Cover
Copy the model and parent
part number here:
SPARK ARRESTOR NOTE
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 #753-04689 Spark Arrestor Kit.
CALIFORNIA PROPOSITION 65 WARNING
WARNING
THE ENGINE EXHAUST FROM THIS
PRODUCT CONTAINS CHEMICALS
KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER, BIRTH DEFECTS
OR OTHER REPRODUCTIVE HARM.
MODEL :
S/N :
ITEM :
3
RULES FOR SAFE OPERATION
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 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 0.080 inch (2.03 mm) diameter original
equipment manufacturer replacement line. Never use
metal-reinforced line, wire, chain or rope. These can
break off and become dangerous projectiles.
• 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.
• This unit was not designed to be used as a
brushcutter. Do not attach or operate this unit with any
type of brushcutting blade or brushcutting attachment.
SAFETY WARNINGS FOR GAS TRIMMERS
• 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.
SYMBOL MEANING
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.
NOTE: Advises you of information or instructions vital to
the operation or maintenance of the equipment.
SYMBOL MEANING
When using the unit,
you must follow the
safety rules. Please read these instructions
before operating the unit in order to ensure
the safety of the operator and any bystanders.
Please keep these instructions for later use.
WARNING:
• IMPORTANT SAFETY INSTRUCTIONS •
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.
WARNING:
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.
DANGER:
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.
CAUTION:
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.
SAFETY ALERT:
Gasoline is highly
flammable, and its
vapors can explode if ignited. Take the
following precautions:
WARNING:
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.
FOR QUESTIONS, CALL 1-800-345-8746 in the
United States, or 1-800-668-1238 in Canada
4
• 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 does not have a clutch. The cutting
attachment continues rotating when the engine is
idling. If it does not, have the unit adjusted by an
authorized service technician.
• Adjust the D-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. Be 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 original equipment manufacturer 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, 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 a faulty muffler and
spark arrestor. Keep the engine and muffler free from
grass, leaves, excessive grease or carbon build up.
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
RULES FOR SAFE OPERATION
5
RULES FOR SAFE OPERATION
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
Z87.1-1989 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.
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.
SYMBOL MEANING
• 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.
•ON/OFF STOP CONTROL
ON / START / RUN
•ON/OFF STOP CONTROL
OFF or STOP
• HOT SURFACE WARNING
Do not touch a hot muffler or
cylinder. You may get burned. These
parts get extremely hot from
operation. When turned off they
remain hot for a short time.
• CHOKE CONTROL
1 • FULL choke position
2 •
PARTIAL choke position
3 •
RUN position
• OIL
Refer to operator's manual for the
proper type of oil.
12
3
6
RULES FOR SAFE OPERATION
APPLICATIONS
As a trimmer:
• Cutting grass and light weeds
• Edging
• Decorative trimming around trees, fences, etc.
KNOW YOUR UNIT
Fuel Cap
Throttle
Control
D-Handle
Shaft
Grip
Primer
Bulb
Blue Choke
Lever
Air Filter/Muffler
Cover
Shaft
Tube
Starter
Rope Grip
Line Cutting Blade
Muffler
On/Off Stop
Control
Cutting Attachment
Cutting
Attachment
Shield
Spark
Plug
7
ASSEMBLY INSTRUCTIONS
Fig. 2
INSTALL AND ADJUST THE D-HANDLE
1. Push the D-handle down onto the shaft housing so
that the handle slants towards the shaft grip (Fig. 1).
The squared bolt hole in the handle is to the right.
2. Insert the shoulder bolt into the squared hole in the
handle and push through. On the left side of the
handle, place the washer on the bolt, then screw the
wing nut onto the bolt. Do not tighten until you make
the handle adjustment.
3. Rotate the D-handle to place the grip above the top
of the shaft housing. Place it a minimum of 6 inches
(15.24 cm) from the end of the shaft grip.
4. While holding the unit in the operating position
(Fig. 2), position the D-handle to the location that
provides you the best grip.
5. Tighten the wing nut until the D-handle is secure.
Fig. 1
Bolt
Washer
Wing Nut
Tighten
Shaft Grip
D-Handle
Minimum 6 inches
(15.24 cm)
Shaft Housing
INST ALL THE CUTTING ATTACHMENT SHIELD
Use the following instructions if the cutting attachment
shield on your unit is not installed.
1. Slide the cutting attachment shield into the shield
mount on the cutting attachment. Align the screw
holes in the shield mount with the holes in the cutting
attachment (Fig. 3).
2. Place one of the three (3) supplied hex lock nuts into
one of the three recessed holes on the top of the
cutting attachment shield (Fig. 4).
3. Install a screw into the hole from the bottom of the
cutting attachment shield. Screw it into the nut installed
in Step 2 until started (Fig. 5). Do not tighten.
4. Repeat Steps 2 and 3 until all three screws have
been started. Then tighten all screws securely with a
Phillips head screwdriver.
Shaft Housing
Recessed Holes
Cutting
Attachment
Shaft Housing
Shield
Mount
Cutting
Attachment
Shield
Cutting
Attachment
(3) Screws
Hex Lock Nut
Fig. 3
Fig. 4
Fig. 5
To prevent serious
personal injury,
never operate the trimmer without the
cutting attachment shield in place.
WARNING:
8
OIL AND FUEL INFORMATION
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 are the main reasons
for the unit not running properly. 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 the fresh fuel mix explained in 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 our 2-cycle oil with this unit.
If unavailable, use a good 2-cycle oil designed for
air-cooled 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.
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 GALLON US
(3.8 LITERS)
3.2 FL. OZ.
(95 ml)
1 LITER 25 ml
+
MIXING RATIO - 40:1
Add fuel in a clean,
well ventilated
outdoor area. Wipe up any spilled fuel
immediately. Avoid creating a source of
ignition for spilt fuel. Do not start the engine
until fuel vapors dissipate.
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:
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.
CAUTION:
9
STARTING/STOPPING INSTRUCTIONS
Fig. 6
Starting
Position
Start/On (I)
Stop/Off (O)
Starter Rope
Throttle Control
Fig. 8
Fig. 7
Blue Choke
Lever
Position
1
Position 3
Position 2
Primer Bulb
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 (Fig. 8).
To avoid serious injury, the operator and unit must be
in a stable position while starting.
WARNING:
STARTING INSTRUCTIONS
STOPPING INSTRUCTIONS
1. Release your hand from the throttle control. Allow the engine
to cool down by idling.
2. Put the On/Off Stop Control in the OFF (O) position.
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 in the ON ( I )
position (Fig. 6).
3. Fully press and release the primer bulb 10 times,
slowly. Some amount of fuel should be visible in the
primer bulb and fuel lines (Fig. 7). 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. Place the blue choke lever in Position 1 (Fig. 7).
5. Crouch in the starting position (Fig. 8) and squeeze the
throttle control. Pull the starter rope out with a
controlled and steady motion 5 times.
NOTE: The unit uses EZ-Pull Version 3™, which significantly
reduces the effort required to start the engine. You
must pull the starter rope out far enough to hear the
engine attempt to start. There is no need to pull the
rope briskly-- there is no harsh resistance when
pulling. Be aware that this starting method is vastly
different from (and much easier than) what you may
be used to.
6. Place the blue choke lever in Position 2.
7. While squeezing the throttle control, pull the starter
rope out with a controlled and steady motion until the
engine starts.
8. Keep the throttle squeezed and allow the engine to
warm up for 15 to 30 seconds.
9. Place the blue choke lever in Position 3. The unit is
ready for use.
NOTE: Move the blue choke lever to Position 3 for best
engine performance. DO NOT leave the lever in
Position 2.
IF... The engine does not start, go back to step 3.
IF... The engine fails to start after a few attempts, place
the blue choke lever in Position 3 and squeeze the
throttle control. Pull the starter rope briskly 3 to 8
times. The engine should start. If not, repeat.
IF WARM... If the engine is already warm, make sure the
On/Off Stop control is in the ON position and start the
unit with the blue choke lever in Position 2. After the
unit starts, move the blue choke lever to Position 3.
10
OPERATING INSTRUCTIONS
NOTE: Do not rest the Bump Head™ on the ground
while the unit is running.
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• 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) by working from top
to bottom in small increments to avoid premature line
wear or engine drag.
• Cut from right to left whenever possible. Cutting to the left
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 forwardbackward 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;
• Adherence of the listed trimming techniques
• What vegetation is 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.
HOLDING THE TRIMMER
Before operating the unit, stand in the operating position
(Fig. 9). 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 D-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
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 (Fig. 10) while operating the trimmer at high speed.
NOTE: Always keep the trimming line fully extended.
Line release becomes more difficult as cutting
line becomes shorter
Fig. 10
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.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all
vegetation around trees, posts, fences, etc.
Rotate the whole unit so that the cutting attachment is at
a 30° angle to the ground (Fig. 11).
Fig. 11
Fig. 9
Do not remove or alter
the line cutting blade
assembly. Excessive line length will make the
unit overheat. This may lead to serious
personal injury or damage to the unit.
CAUTION:
Always wear eye,
hearing, foot and
body protection to reduce the risk of injury
when operating this unit.
WARNING:
11
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 8
Every 10 hours Clean and re-oil air filter Page 13
Every 25 hours
Check and clean spark arrestor
Check spark plug condition and gap
Page 14
Page 15
Every 50 hours
Inspect exhaust port and spark arrestor screen for clogging or
obstruction to assure maximum performance levels
Page 14
MAINTENANCE AND REPAIR INSTRUCTIONS
LINE INSTALLATION
This section covers both SplitLine™ and standard single
line installation.
Always use original equipment manufacturer 0.080 in.
(2.03 mm) replacement line. Line other than the specified
may make the engine overheat or fail.
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 (Fig. 12). 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 (Fig. 13).
3. Remove spring from the inner reel (Fig. 13).
4. Use a clean cloth to clean the the inner reel, spring,
shaft, and inner surface of the outer spool.
5. Check the indexing teeth on the inner reel and outer
spool for wear (Fig. 14). If necessary, remove burrs or
replace the reel and spool.
Bump Knob™
Bolt
Fig. 12
Inner Reel
Spring
Outer Spool
Indexing Teeth
Fig. 14
Fig. 13
Never use metal-
reinforced line, wire,
chain or rope. These can break off and
become dangerous projectiles.
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.
WARNING:
12
MAINTENANCE AND REPAIR INSTRUCTIONS
Fig. 19
Fig. 15
NOTE: SplitLine™ can only be used with the inner reel
with the slotted holes. Single line can be used on
either type of inner reel. Use Figure 15 to identify
the inner reel you have.
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. Take approximately 20 feet (6 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. 16). Pull the line through the inner reel so that
the loop is as small as possible.
7. Wind the lines in tight even layers, onto the reel
(Fig. 17). 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. Take approximately 10 feet (3 m) of new trimming
line. Insert one end of the line through one of the two
holes in the inner reel (Fig. 18). Pull the line through
the inner reel until only about 4 inches is left out.
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 (Fig. 18).
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.
Slotted
Holes
For Use with SplitLine™
or Single Line
For Use with Single
Line ONLY
Holding Slots
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 clockwise. Tighten securely.
12. Insert the ends of the line into the two holding slots
(Fig. 19).
13. Insert the ends of the line through the eyelets in the
outer spool and place inner reel with spring inside the
outer spool (Fig. 20). 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.
Loop
Fig. 16
Fig. 17
Loop
Fig. 18
Spring
Fig. 20
13
MAINTENANCE AND REPAIR INSTRUCTIONS
AIR FILTER MAINTENANCE
Removing the Air Filter/Muffler Cover
1.
Place the
blue
choke lever in Position 2
(Fig. 21)
.
NOTE: The blue choke lever must be in Position 2 to
remove the air filter/ muffler cover.
2. Remove the four (4) screws securing the air
filter/muffler cover (Fig. 21). Use a T-20 Torx bit
screwdriver.
3. Pull the cover from the engine. Do not force.
INSTALLING A PREWOUND REEL
1. Hold the outer spool with one hand and unscrew the
bump knob counterclockwise (Fig. 12). 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
(Fig. 13).
3. Remove the spring from the old inner reel
(Fig. 13).
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 (Fig. 20).
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 spool.
7. Hold the inner reel in place and install the bump knob
by turning clockwise. Tighten securely.
Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation.
It is an important item to maintain. Failure to maintain
your air filter properly can result in poor performance or
can cause permanent damage to your engine.
1. Remove air filter/muffler cover. Refer to 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 (Fig. 22).
3. Wash the filter in detergent and water (Fig. 23). 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
(Fig. 24).
5. Squeeze the filter to spread and remove excess oil
(Fig. 25).
Fig. 23
Fig. 24
Fig. 25
6. Replace the air filter inside the air filter/muffler cover
(Fig. 22).
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 (Fig. 21) and tighten.
Do not over tighten.
Air Filter
Inside Muffler
Cover
Blue Choke
Lever
Screws
Screws
Position 2
Fig. 21
To avoid serious
personal injury ,
always turn your unit off and allow it to cool
before you clean or service it.
WARNING:
Fig. 22
14
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air
filter/muffler cover (Fig. 27).
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.
MAINTENANCE AND REPAIR INSTRUCTIONS
SPARK ARRESTOR MAINTENANCE
NOTE: The exhaust can only flow in one direction: AWAY
from the engine. Pay close attention when
disassembling the muffler so you can put it back
together correctly. Failure to do so will damage
the unit and may cause serious personal injury.
1. Remove air filter/muffler cover. Refer to Removing
the Air Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the two
(2) screws on the bottom of the muffler (Fig. 26).
These two screws hold the Spark Arrestor Hood
Assembly and the spark arrestor screen to the
bottom of the muffler. Remove the two (2) screws
using either a torx #20 or flat blade screwdriver.
3. Using a small flat blade screwdriver, carefully pry up
the spark arrestor screen from the recessed hole,
taking care to notice that the “raised” part of the
spark arrestor screen is inside the recessed hole.
Remove the spark arrestor screen from the muffler.
4. Clean the spark arrestor screen with a wire brush.
Replace it if it is damaged, or if you are unable to
clean it thoroughly.
5. Reinstall the spark arrestor screen by putting the
“raised” portion of the screen inside the recessed
hole of the muffler. Make sure that the spark arrestor
screen fits flat against the muffler.
6. Place the spark arrestor plate on top of the spark
arrestor with the “raised” side up and the opening
facing towards the engine (Fig. 26).
7. Place the spark arrestor hood on top of the spark
arrestor plate with the “raised” side up and the
opening facing AWAY from the engine (Fig. 26). Verify
that the exhaust will be directed AWAY from the
engine.
8. Replace the two screws you removed in Step 2 and
tighten them securely.
9. Reinstall the air filter/muffler cover.
If the exhaust
deflector assembly is
not tightened securely, it could fall off causing
damage to the unit and possible serious
personal injury.
WARNING:
Spark Arrestor
Screen
Spark Arrestor
Plate
Spark Arrestor
Hood
Screws
Muffler
Recessed Hole
Engine
Spark Arrestor Hood
Assembly Includes:
Spark Arrestor Plate
Spark Arrestor Hood
and Screws
Opening
Fig. 26
15
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 Screw
If, after checking the fuel mixture and cleaning the air
filter, the engine still will not idle, adjust the idle speed
screw as follows:
1. Start the engine and let it run at a high idle for a
minute to warm up. Refer to Starting/Stopping
Instructions.
2. Release the throttle trigger and let the engine idle. If
the engine stops, insert a small phillips screwdriver
into the hole in the air filter/muffler cover (Fig. 27).
Turn the idle speed screw in, clockwise, 1/8 of a
turn at a time (as needed) until the engine idles
smoothly.
3. If the engine appears to be idling too fast, 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 not and all of the following are 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.
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-inch socket
counterclockwise.
3. Replace a cracked, fouled or dirty spark plug. Set
the air gap at 0.020 in. (0.5 mm) using a feeler gauge
(Fig. 28).
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)
Fig. 28
MAINTENANCE AND REPAIR INSTRUCTIONS
Idle Speed Screw
Fig. 27
The cutting
attachment will spin
during idle speed adjustments. Wear
protective clothing and observe all safety
instructions to prevent serious personal injury.
WARNING:
To prevent serious
personal injury,
make sure the cutting attachment has
stopped rotating after you turn it off and
before you set it down.
WARNING:
Do not sand blast,
scrape or clean
electrodes. Grit in the engine could damage
the cylinder.
WARNING:
16
MAINTENANCE AND REPAIR INSTRUCTIONS
CLEANING
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 a fueled unit 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.
LONG TERM STORAGE
If you plan on storing the unit 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.
TRANSPORTING
• Allow the engine to cool before transporting.
• Drain fuel from unit.
• Tighten fuel cap before transporting.
• Secure the unit while transporting.
To avoid serious
personal injury,
always turn your trimmer off and allow it to
cool before you clean or service it.
WARNING:
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
2-cycle 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 it for any loose
or damaged parts. Repair or replace damaged parts
and tighten loose screws, nuts or bolts. The unit is
ready for storage.
17
If further assistance is required, contact your authorized service dealer.
CAUSE ACTION
Cutting attachment bound with grass Stop the engine and clean cutting attachment
Cutting attachment out of line Refill with new line
Inner reel bound up Replace the inner reel
Cutting head dirty Clean inner reel and outer spool
Line welded Disassemble, remove the welded section and rewind
Line twisted when refilled Disassemble and rewind the line
Not enough line is exposed Push the bump knob and pull out line until 4 inches
(102 mm) of line is outside of the cutting attachment
CAUSE ACTION
Old or improperly mixed fuel Drain gas tank and add fresh fuel mixture
Improper carburetor adjustment Take to an authorized service dealer for an adjustment
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
CAUSE ACTION
Empty fuel tank Fill fuel tank with properly mixed fuel
Primer bulb wasn't pressed enough Press primer bulb fully and slowly 10 times
Engine is flooded Squeeze the trigger and pull the starter rope
Old or improperly mixed fuel Drain gas tank and add fresh fuel mixture
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
On/Off Control set to Off (O) Set control to On (I)
ENGINE WILL NOT START
ENGINE WILL NOT IDLE
ENGINE WILL NOT ACCELERATE
ENGINE LACKS POWER OR STALLS WHEN CUTTING
CAUSE ACTION
Air filter is plugged Replace or clean the air filter
Old or improperly mixed fuel Drain gas tank and add fresh fuel mixture
Improper carburetor adjustment Adjust according to the Carburetor Adjustments section
CAUSE ACTION
Old or improperly mixed fuel Drain gas tank and add fresh fuel mixture
Improper carburetor adjustment Take to an authorized service dealer for an adjustment
Cutting attachment bound with grass Stop the engine and clean the cutting attachment
Dirty air filter Clean or replace the air filter
Plugged spark arrestor Clean or replace spark arrestor
CUTTING ATTACHMENT WILL NOT ADVANCE LINE
CAUSE ACTION
Oil, cleaner or lubricant in cutting head Clean and thoroughly dry the cutting head
CUTTING LINE ADVANCES UNCONTROLLABLY
TROUBLESHOOTING
18
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.)
Operating RPM.................................................................................................................................................. 8,000
+ rpm
Idle Speed RPM ...................................................................................................................................... 3,200 - 4,400 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................................................................................................................................... 15 fl.oz. (444 ml.)
Drive Shaft Housing ............................................................................................................................................ Steel Tube
Throttle Control ........................................................................................................................................ Finger-Tip Trigger
Unit Weight (No fuel, with cutting attachment, shield and D-handle) ............................................................ 11 lbs. (5 kg.)
Cutting Mechanism........................................................................................................................................ Bump Head™
Shoulder Strap ........................................................................................................................................................ Optional
Line Spool Diameter.................................................................................................................................... 3 in. (76.2 mm.)
Trimming Line Diameter....................................................................................................................... 0.080 in. (2.03 mm.)
Cutting Path Diameter.............................................................................................................................. 17 in. (43.18 cm.)
19
California / EPA Emission Control Warranty Statement
Your Warranty Rights and Obligations
The California Air Resources Board, the Environmental Protection Agency and MTD LLC (MTD) are pleased to explain
the emission control system warranty on your 2000 and later small off-road engine. New small off-road engines must be
designed, built and equipped to meet stringent anti-smog standards. MTD 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 off-road 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, MTD will repair your small off-road engine at no cost to you including diagnosis,
parts and labor.
The 2000 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 by MTD.
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. MTD recommends that you retain all receipts covering maintenance on your small off-road engine,
but MTD 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 MTD 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 MTD 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 MTD Service
Center. For the nearest location please contact MTD 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 MTD 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 MTD Service Center. Warranty services or repairs will be
provided at all Authorized MTD 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.
MANUFACTURER’S LIMITED WARRANTY FOR:
No implied warranty, including any implied warranty of
merchantability or fitness for a particular purpose,
applies after the applicable period of express written
warranty above as to the parts as identified. No other
express warranty or guaranty, whether written or oral,
except as mentioned above, given by any person or
entity, including a dealer or retailer, with respect to any
product shall bind MTD. During the period of the
Warranty, the exclusive remedy is repair or replacement
of the product as set forth above. (Some states do not
allow limitations on how long an implied warranty lasts, so
the above limitation may not apply to you.)
The provisions as set forth in this Warranty provide the
sole and exclusive remedy arising from the sales. MTD
shall not be liable for incidental or consequential loss or
damages including, without limitation, expenses
incurred for substitute or replacement lawn care
services, for transportation or for related expenses, or
for rental expenses to temporarily replace a warranted
product. (Some states do not allow limitations on how long
an implied warranty lasts, so the above limitation may not
apply to you.)
In no event shall recovery of any kind be greater than the
amount of the purchase price of the product sold.
Alteration of the safety features of the product shall void
this Warranty. You assume the risk and liability for loss,
damage, or injury to you and your property and/or to
others and their property arising out of the use or misuse or
inability to use the product.
This limited warranty shall not extend to anyone other than
the original purchaser, original lessee or the person for
whom it was purchased as a gift.
How State Law Relates to this Warranty: This warranty
gives you specific legal rights, and you may also have other
rights which vary from state to state.
To locate your nearest service dealer dial 1-800-345-8746
in the United States or 1-800-668-1238 in Canada.
MTD LLC
P.O. Box 361131
Cleveland, OH 44136-0019
The limited warranty set forth below is given by MTD LLC
(“MTD”) with respect with new merchandise purchased and
used in the United States, its possessions and territories.
MTD warrants this product against defects in material and
workmanship for a period of two (2) years commencing on the
date of original purchase and will, at its option, repair or
replace, free of charge, any part found to be defective in
material or workmanship. This limited warranty shall only
apply if this product has been operated and maintained in
accordance with the Operator’s Manual furnished with the
product, and has not been subject to misuse, abuse,
commercial use, neglect, accident, improper maintenance,
alteration, vandalism, theft, fire, water or damage because of
other peril or natural disaster. Damage resulting from the
installation or use of any accessory or attachment not
approved by MTD for use with the product(s) covered by this
manual will void your warranty as to any resulting damage.
This warranty is limited to ninety (90) days from the date of
original retail purchase for any MTD product that is used for
rental or commercial purposes, or any other incomeproducing purpose.
HOW TO OBTAIN SERVICE: Warranty service is available,
WITH PROOF OF PURCHASE THROUGH YOUR LOCAL
AUTHORIZED SERVICE DEALER. To locate the dealer in your
area, please check for a listing in the Yellow Pages or contact
the Customer Service Department of MTD LLC by calling
1-800-345-8746 or writing to P.O. Box 361131, Cleveland
OH 44136-0019 or if in Canada call 1-800-668-1238. No
product returned directly to the factory will be accepted
unless prior written permission has been extended by the
Customer Service Department of MTD LLC.
This limited warranty does not provide coverage in the
following cases:
A. Tune-ups - Spark Plugs, Carburetor Adjustments,
Filters
B. Wear items - Bump Knobs, Outer Spools,Cutting Line,
Inner Reels, Starter Pulley,Starter Ropes, Drive Belts
C. MTD does not extend any warranty for products sold or
exported outside of the United States of America, its
possessions and territories, except those sold through
MTD’s authorized channels of export distribution.
MTD reserves the right to change or improve the design of
any McCulloch Product without assuming any obligation to
modify any product previously manufactured.
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