MTD 752Z365-SUB, 752Z270-SU, 752Z265-SU, 752Z265-JU, 752Z170-L0 Owner’s Manual

Safe Operation Practices • Set-Up • Operation • Maintenance • Troubleshooting • Warranty

OPER roR's

L

179cc & 208cc OHV Horizontal Shaft Engine

752Z165-SUB, 752Z265-SU, 752Z365-SUB, 752Z265-JU, 752Z365-JU,

752Z270-SU, 752Z370-SUB, 752Z170-LO, 752Z170-COA

MTD LLC, P.O. BOX 361131 CLEVELAND, OHIO 44136-0019

PrintedIn USA FormNo.769-06052

(April1,2010)

ToTheOwner

ThankYou

This Operator's Manual isan important part of your newengine. It will help you prepare and maintain the engine for the best
performance. Pleaseread and understand the contents before operating the engine.

Tableof Contents

Safe Operation Practices ........................................ 3

Safety Labels ............................................................ 5

Set-Up ....................................................................... 6

Controls & Features ................................................. 9

Operation ................................................................ 10

Maintenance ........................................................... 13

Troubleshooting ..................................................... 19

Replacement Parts ................................................ 20

Warranty ................................................................. 21

Spanish ................................................................... 23

1

RecordProductInformation

Before operating your new engine, please locate the model plate
on the engine and record the information in the provided area

MODEL NUMBER/SERIAL NUMBER

to the right. This information will be necessary, should you seek
technical support via our web site or with your local dealer.

E[3E[3E[3E/EDEEEEEEEEEE

CustomerSupport

Please do NOT return the machine to the retailer or dealer without first contacting our Customer Support Department.

If you have difficulty with this product or have any questions regarding the controls, operation, or maintenance of this
engine, you can seek help from the experts. Choose from the options below:

Visit us on the web at www.mtdproducts.com
Call a Customer Support Representative at [phone] or [phone]

Write us at MTD LLC • P.O.Box 361131 • Cleveland, OH •44136-0019

ImportantSafeOperationPractices

WARNING! This symbol points out important safety instructions which, if not followed,

could endanger the personal safety and/or property of yourself and others. Read and follow
all instructions in this manual before attempting to operate the equipment. Failure to

comply with these instructions may result in personal injury. When you see this symbol.

HEED IT'S WARNING!

CALIFORNIA PROPOSITION 65

WARNING! Engine Exhaust, some of its constituents, and certain vehicle components

contain or emit chemicals known to State of California to cause cancer and birth defects
or other reproductive harm.

DANGER! This machine was built to be operated according to the safe operation practices
in this manual. As with any type of power equipment, carelessness or error on the part of the
operator can result in serious injury. This machine is capable of amputating fingers, hands,

toes and feet and throwing foreign objects. Failure to observe the following safety

instructions could result in serious injury or death.

2

Training 4.

1. Read, understand and follow all instructions on the engine
and in the manual(s) before attempting to assemble and
operate. Keep this manual in a safe place for future and
regular reference and for ordering replacement parts.

2. Be familiar with all controls and their proper operation.
Know how to stop the engine and disengage them quickly.

3. Never allow children under 14 years of age to operate the
engine. Children 14 and over should read and understand
the instructions and safe operation practices in this manual
and on the engine and be trained and supervised by an

adult.

4.

Never allow adults to operate the machine without proper
instruction.

5.

Keep the area of operation clear of all persons, particularly
small children and pets. Stop machine if anyone enters the
area.

5.

SafeHandling0f Gas01ine:

6. To avoid personal injury or property damage, use extreme

Preparation

1. Thoroughly inspect the area where the equipment is to
be used. Remove all stones, sticks, wire and other foreign
objects which could be tripped over and cause personal

injury.

2. Wear sturdy, rough-soled work shoes and close fitting
slacks and shirts. Loose fitting clothes or jewelry can be
caught in the moving parts. Never operate the machine in

bare feet or sandals.

3.

Disengage clutch levers and shift (if equipped) into nuetral
("N") before starting the engine.

Never leave the engine running while unattended.
Never attempt to make any adjustments while the engine

is running, except where specifically recommended in the
operator's manual.

care in handling gasoline. Gasoline is extremely flammable
and the vapors are explosive. Serious personal injury can
occur when gasoline is spilled on yourself and/or your
clothes which can ignite. Wash your skin and change

clothes immediately.

a. When adding fuel, turn engine OFF and let engine

cool at least 2 minutes before removing the gas cap.

b. Fill fuel tank outdoors or in well ventilated area.
c. Use only an approved gasoline container.

d. Never fill containers inside a vehicle or on a truck

or trailer bed with a plastic linen Always place
containers on the ground away from your vehicle
before filling.

e. If possible, remove gas-powered equipment from

the truck or trailer and refuel it on the ground. If this
is not possible, then refuel such equipment on a
trailer with a portable container, rather than from a

gasoline dispenser nozzle.

f. Keep the nozzle in contact with the rim of the fuel

tank or container opening at all times until fueling is
complete. Do not use a nozzle lock-open device.

g. Donotoverfillfueltank.Filltanktonomorethan

1/2inchbelowthebottomofthefillernecktoallow
spaceforfuelexpansion.

h. Replacegasolinecapandtightenitsecurely.
i. Ifgasolineisspilled,wipeitofftheengineandthe

equipment.Movethemachinetoanotherarea.Wait
fiveminutesbeforestartingtheengine.

j. Toreducefirehazards,keepthemachinefreeof

grass,leavesorotherdebrisbuildup.Cleanupoilor
fuelspillageandremoveanyfuel-soakeddebris.

k. Keepgasolineawayfromsparks,openflames,pilot

lights,heat,andotherignitionsources.

I. Neverfuelequipmentindoorsbecauseflammable

vaporswillaccumulateinthearea.

m. Extinguishallcigarettes,cigars,pipes,andother

sourcesofignition.

n. Checkfuelline,tank,cap,andfittingsfrequentlyfor

cracksorleaks.Replaceifnecessary.

Operation

1. When starting the engine, make sure spark plug, muffler,
and fuel cap are in place.

2. Do not crank engine with spark plug removed.

3. If fuel spills, wait until it evaporates before starting engine.

4. Allow muffler, engine cylinder, and fins to cool before
touching.

5. Keep children away from hot or running engines. They can
suffer burns from a hot muffler.

6. Remove accumulated combustibles from muffler and
cylinder area.

7. Operate equipment with all guards in place.

8. Keep hands and feet away from rotating parts.

9. Tie up long hair and remove jewelry.

10. Do not wear loose-fitting clothing, dangling drawstrings or
items that could become caught.

11. When starting the engine, pull cord slowly until resistance
is felt, then pull rapidly.

12. Remove all external equipment/engine loads before
starting engine.

13. Direct coupled equipment components such as, but not
limited to blades, impellers, pulleys, sprockets, etc., must
be securely attached.

Maintenance& Storage

1. Keep the engine in safe working order

2. Allow the engine to cool at least five minutes before
storing. Never tamper with safety devices. Check their
proper operation regularly.

3. Check bolts and screws for proper tightness at frequent
intervals to keep the engine in safe working condition.
Visually inspect the engine for any damage.

4. Before cleaning, repairing or inspecting; stop the
engine and make certain all moving parts have stopped.
Disconnect the spark plug wire and ground it against the
engine to prevent unintended starting.

5. Do not change the engine governor settings or over-speed
the engine. The governor controls the maximum safe
operating speed of the engine.

6. Maintain and replace safety and instruction labels as
necessary.

7. Always refer to the operator's manual for important details
if the machine is to be stored for an extended period of
time.

8.

If the fuel tank has to be drained, do this outdoors.

9.

Observe proper disposal laws and regulations for gas,oil,
etc. to protect the environment.

Donot modify engine

To avoid serious injury or death, do not modify engine in any
way. Tampering with the governor setting can lead to a runaway
engine and cause it to operate at unsafe speeds. Never tamper
with factory setting of engine governor.

Notice Regarding Emissions

Engines which are certified to comply with California and federal
EPA emission regulations for SORE (Small Off Road Equipment)

are certified to operate on regular unleaded gasoline, and
may include the following emission control systems: Engine
Modification (EM), Oxidizing Catalyst (OC), Secondary Air
Injection (SAI) and Three Way Catalyst (TWC) if so equipped.

SparkArrestor

_ ARNING! This machine is equipped with an

Ifa spark arrestor is used, it should be maintained in effective
working order by the operator. In the State of California the

above is required by law (Section 4442 of the California Public
Resources Code). Other states may have similar laws. Federal laws
apply on federal lands.
A spark arrestor for the muffler is available through your

nearest engine authorized service dealer or contact the service
department, P.O.Box 361131 Cleveland, Ohio 44136-0019.

internal combustion engine and should not be used
on or near any unimproved forest-covered, brush

covered or grass-covered land unless the engine's
exhaust system is equipped with a spark arrestor
meeting applicable local or state laws (if any).

4 I SECTION 2 -- IMPORTANT ENGINE SAFE OPERATION PRACTICES

Safety Symbols

This page depicts and describes safety symbols that may appear on this product. Read, understand, and follow all instructions on the
machine before attempting to assemble and operate.

READ THE OPERATOR'S MANUAL(S)
Read, understand, and follow all instructions in the manual(s) before attempting to

assemble and operate

WARNING--GASOLINE IS FLAMMABLE
Allow the engine to cool at least two minutes before refueling.

WARNING-- CARBON MONOXIDE

Never run an engine indoors or in a poorly ventilated area. Engine exhaust contains carbon
monoxide, an odorless and deadly gas.

WARNING-- ELECTRICAL SHOCK

Do not use the engine's electric starter in the rain

WARNING-- HOT SURFACE

Engine parts, especially the muffler, become extremely hot during operation. Allow engine

and muffler to cool before touching.

WARNING! Your Responsibility- Restrict the use of this power machine to persons who read, understand and
follow the warnings and instructions in this manual and on the machine.

SAVETHESEINSTRUCTIONS!

SECTION 2 -- IMPORTANT ENGINE SAFE OPERATION PRACTICES S

Set-Up

3

Oil & Fuel Specifications

NOTE:The engine is shipped without gasoline in the engine.
Running the engine with insufficient oil can cause serious engine

damage and void the engine warranty.

IMPORTANT: Some engines are shipped with oil already in

the engine, others without oil already in the engine. It is very
important to check the oil level before operating the engine and
to add oil if necessary. Running the engine with insufficient oil

can cause serious engine damage and void the engine warranty

Oil Recommendations

Before starting engine, fill with motor oil, capacity is 600 ml/20
oz. Refer to viscosity chart in Fig. 3-1 for oil recommendations.

Do not over-fill. Use a 4-stroke, or an equivalent high detergent,
premium quality motor oil certified to meet or exceed
U.S. automobile manufacturer's requirements for service

m

_30

40 m_

20w4020w50__i_m_lb

I I v

15w40, 10m'_ s_mH Imu _um _m'_ _

I _"

10w40 .....

I v

10w30 ___m

CheckingOilLevelon Engineswith Quarter-TurnOil FillCaps

NOTE: Be sure to check the oil while on a level surface with the
engine stopped.

To avoid engine damage, it is important to:

Check oil level before each use and every 5 operating
hours when engine is warm. Check oil level more

frequently during engine break-in.
Keep oil level between "H" and "L" marks on dipstick.

See Fig. 3-2.
Be sure oil fill cap/plug is tightened securely when

checking.

I. Remove the oil filler cap/dipstick and wipe the dipstick

clean. See Fig. 3-2.

2. Insert the cap/dipstick into the oil filler neck, and tighten
the cap until seated.

3. Remove the oil filler cap/dipstick. If the level is low, slowly
add oil until oil level registers between high (H) and low (L),

Fig. 3-2.

4. Replace and tighten cap/dipstick firmly before starting
engine.

NOTE: Do not overfill. Overfilling with oil may cause smoking,
hard starting, or spark plug fouling.

NOTE: DO NOT allow oil level to fall below the "L" mark on the
dipstick. Doing so may result in equipment malfunctions or

damage.
NOTE:To change the oil on your engine, see the Maintenance

Section of this manual.

f

(°C)-30o -20o -10° 0° 10° 20° 30° 40°
(°F)-20o 0° 20° 40° 60° 80° 100°

Figure 3-1

classification SG, SF.Motor oils classified SG, SF will show this
designation on the container.

NOTE: Do not use non-detergent oil or 2-stroke engine oil. It
could shorten the engine's service life.

Checkingthe Oil Level

Some engines will have a quarter-turn oil fill/dipstick cap, others
may have a threaded oil fill/dipstick cap. Follow the instructions

next that apply to your engine model.

Figure 3-2

CheckingOilLevelon Engineswith ThreadedOilFill Caps

NOTE; Be sure to check the oil while on a level surface with the
engine stopped.

To avoid engine damage, it is important to:

Check oil level before each use and every S operating
hours when engine is warm. Check oil level more

frequently during engine break-in.
Keep oil level between "H" and "L" marks on dipstick.

See Fig. 3-3.
Be sure to rest oil fill cap on the threads when

checking. Do not tighten down oil fill cap when
checking the oil on threaded oil fill cap engines.

I. Remove the oil filler cap/dipstick and wipe the dipstick

clean. See Fig. 3-3.

2. Insert the cap/dipstick into the oil filler neck, but do not
screw it in.

3. Remove the oil filler cap/dipstick. If the level is low, slowly
add oil until oil level registers between high (H) and low (L),
Fig. 3-3.

4. Replace and tighten cap/dipstick firmly before starting
engine.

NOTE: Do not overfill. Overfilling with oil may cause smoking,
hard starting, or spark plug fouling.

NOTE: DO NOTallow oil level to fall below the "L" mark on the
dipstick. Doing so may result in equipment malfunctions or

damage.
NOTE: To change the oil on your engine, see the Maintenance

Section of this manual.

FillingOilSump

I. Be sure the engine is upright and level.

2. Remove the oil fill cap dipstick from oil filler tube by
rotating counter-clockwise and lifting the dipstick out of

the engine. Wipe the dipstick clean with a shop rag.

3. Insert oil fill cap dipstick back into oil filler tube. On
quarter-turn oil fill caps, tighten by rotating the cap
clockwise until firmly seated.

NOTE:Some units may have a threaded dipstick. In this
instance, insert the cap/dipstick into the oil filler neck, but

do not screw it in to check.

4. Loosen and remove the oil fill cap dipstick from the oil
filler tube. Note the oil level, if oil reading on the dipstick
is below the "L" mark, slowly add oil to reach the "H" level.
See Fig. 3-2 or 3-3, whichever is applicable.

S. Insert oil fill cap dipstick back into oil filler tube. Tighten by

rotating the cap clockwise until firmly seated.

6. Wipe away any spilled oil.
/VOTE:To change the oil, see Checking and Changing Oil

instructions in the Maintenance Section of this manual.

Figure 3-3

SECTION2 -- SET-UP 7

FuelRecommendations

oil/gasoline mixture, dirty gasoline, or gasoline over

CAUTION: Operating the engine with E85 fuel, an

30 days old that has not been stabilized using a fuel
additive, may result in damage to your engine's

carburetor. Subsequent damage would not be
covered under the manufacturer's warranty.

Use automotive gasoline (unleaded or low leaded to minimize
combustion chamber deposits) with a minimum of 87 octane.
Gasoline with up to 10% ethanol or 15% MTBE (Methyl Tertiary

Butyl Ether) can be used. Never use an oil/gasoline mixture or
dirty gasoline. Avoid getting dirt, dust, or water in the fuel tank.
DO NOT use E85 gasoline.

¢

Fuel Level Indicator

TopView

_ WARNING! Gasoline is extremely flammable and is

explosive under certain conditions.

Refuel in a well-ventilated area with the engine stopped.
Do not smoke or allow flames or sparks in the area where
the engine is refueled or where gasoline is stored.

Do not overfill the fuel tank. After refueling, make sure the
tank cap is closed properly and securely.

Be careful not to spill fuel when refueling. Spilled fuel or
fuel vapor may ignite. If any fuel is spilled, make sure the

area is dry before starting the engine.
Avoid repeated or prolonged contact with skin or

breathing of vapor.

Adding Fuel

WARNING!An adult should fuel this engine. NEVER
allow children to refuel this engine. Gasoline (fuel)
vapors are highly flammable and can explode. Fuel
vapors can spread and be ignited by a spark or flame

many feet away from engine. To prevent injury or

death from fuel fires, follow these instructions:

DO NOT use leaded fuel.
Fuel must be fresh and clean. NEVER use fuel left over

from last season or stored for long periods.
NEVER mix oil with fuel.

DO NOTusefuel containing Methanol (Wood
Alcohol)

7. Before refueling, allow the engine to cool for two minutes.

8. YBe sure engine is outdoors and in a well-ventilated area.

9. Clean area around the fuel fill cap and remove the fuel fill cap.

10. Using an approved red GASOLINE container, add fuel
slowly, being careful to avoid spilling.

NOTE:On tanks with a fuel level indicator, fill the tank
until the fuel reaches the "fuel full" indicator mark. See Fig.
3-4. All other tanks, fill tank until the fuel reaches a 1/2inch
below the bottom of the filler neck to allow space for fuel
expansion. Be careful not to overfill.

11. Replace the fuel cap and tighten securely. Wipe up spilled
fuel before starting engine. If fuel is spilled DO NOT start

engine. Move machine away from area of spillage. Avoid
creating any source of ignition until fuel vapors are gone.

12. Be sure fuel valve, if present, is open.

Figure 3-4

ElectricalPower

running. Doing so may VOID YOUR WARRANTY.

WARNING! DO NOT pull starter rope with engine

NOTES:When connecting power cord always connect power
cord to switch box on engine first; then into outlet. See Fig. 3-5

Determine what type of power source outlet you will be
connecting the power cord to, before you start your engine.

See Engines with Electric Starters instructions in the Operation
Section of this manual.

Figure 3-5

/

8 I SECTION 2-- SET-UP

ControlsandFeatures

Throttle

Air Filter

Choke

Fuel Shut-off

Valve

Choke_

Recoil Starter

4

Primer....-----4_I

Key

Throttle

Choke

Starter
Button

Electric Starter

Handle

Figure 4-1

Throttle FuelShut-OffVaNe

The throttle control regulates the speed of the engine and will
shut off the engine when it is moved into the stop position.

Choke

Activating the choke closes the choke plate on the carburetor
and aids in starting the engine.

If equipped, is used for controlling the flow of fuel between
usage and transport/storage.

ElectricStarterOutlet

Requires the use of a three-prong outdoor extension cord and a
120V power source/wall outlet.

Oil Drain ElectricStartButton

Removing the oil drain plug will drain the oil from the engine.

Pressing the button on the top of the electric starter switch engages
the engine's electric starter when plugged into a 120V power source.

Oil FillerCap& Dipstick

PrimerBulb

Remove the oil cap to check the oil level and add oil.

FuelFillCap

Remove the gas cap to add fuel.

RecoilStarterHandle

Pull the starter handle to start the engine.

Pressing the primer bulb forces fuel directly into the engine's
carburetor to aid in starting a "Cold" engine.

Key

The key isa safety device. It must be fully inserted in order for the
engine to start. Remove the key when the snow thrower is not in use.

important: Do not turn the key in an attempt to start the

engine. Doing so may cause itto break.

Starter Button

Operation

Pre-OperationCheck

IMPORTANT: The engine isshipped without gasoline in the
engine. Seethe Set-Up Section of this manual for instructions on

adding gasoline.
IMPORTANT: Some engines are shipped with oil already in

the engine, others without oil already in the engine. It isvery
important to check the oil before operating the engine and
to add if necessary. Seethe Set-Up Section of this manual for

instructions on checking and adding oil.
For your safety, and in order to maximize the service life of this

equipment, it is very important to check its condition before you
operate this engine. Make certain to service, correct or fix any
problem that might be identified before attempting to operate
this engine.

i_ WARNING! Improperly maintaining this engine, or

Before you start the engine, always check the following items:

1. Fuel Recommendations (SeeSet UpSection)

2. Checking Oil Level (SeeSetUpSection)

3. Air filter (if equipped) (SeeMaintenance Section)

4. General Overall Inspection. Check for any fluid leaks or

5. Check the owner's manual provided with the equipment

failure to correct any problem before operation can

causea malfunction which could result in serious
injury or even death.

Always perform a pre-operation inspection before

eachoperation, and correct any problem.

discharges, and loose or damaged parts.

that is powered by this engine. Review the owner's manual
for any precautions and procedures that should be

followed before starting the engine.

Starting the Engine

WARNING! Always keep hands and feet clear of

moving parts. Do not use a pressurized starting

fluid. Vapors are flammable.

WARNING! An adult should start the engine. Only
allow children to start the engine if an adult has

determined they areexperienced and capable of
such operation.

WARNING! If you are unable to start this engine
after following instructions in this manual, contact

you authorized MTDService Dealer.To avoid serious

burn injuries or damage to your engine, DO NOT

attempt to start or troubleshoot this engine in any

other way.for example:

DO NOTuse starting fluid.
DO NOTspray flammable vapors into the

carburetor.

DO NOT put flammable liquids into carburetor.

DO NOT operate engine or pull on starter rope
with spark plug removed. Fuel can spray from
spark plug hole and ignite.

NOTE: Allow the engine to warm up for a few minutes after
starting. The engine will not develop full power until it reaches
operating temperatures.

Familiarize yourself with the engine symbols shown in Fig. 5-1
before attempting to start this engine. Ifthis engine is remotely
controlled by the equipment it ispowering, be sure to familiarize
yourself with the equipment Operator's Manual as well.

Fast Slow/Idle Engine Off

I÷1 Ixl "--L)

Run Choke Primer

Figure 5-1

NOTE:The following starting instructions are for several different
types of engines. In order to locate the instructions that apply to
your engine, first determine what type of starter you have. If you

have an electric starter, see Engines With Electric Starters. If you
have a manual recoil starter, see Engines with Recoil Starters later

in this section.

EnginesWith ElectricStarters

Ifyou have a manual recoil starter, see Engines with Recoil
Starters later in this section.

WARNING! DO NOT pull the starter handle while

the engine is running.

WARNING! Some electric starters are equipped

with a 120VA.C. Three-Wire Power Cord and Plug

designed to operated on a 120VA.C.household
current. It must be properly grounded at all times

to avoid the possibility of injury or death from

electrical shock.

a_

Determine if your house wiring has a Ground Fault
Interrupted (G.F.I.) Three-Wire Grounded System; if

you are not sure, ask a Licensed Electrician.

b. IfyourhousewiringdoesnothaveaG.F.I.Three-

WireGroundedSystem,DONOTUSETHISELECTRIC
STARTERUNDERANYCONDITION.

IfyourhousewiringisgroundedandaG.F.I.
three-ProngWallReceptacleisnotavailableatthe

locationwhereyourstarterwillbeused,onemust
beinstalledbyaLicensedElectricianBEFOREUSING

THEELECTRICSTARTER!

1. Toavoidcarbonmonoxidepoisoning,besureengineis
outdoorsinawell-ventilatedarea.

2. Besurefuelvalve,ifpresent(seeequipmentOperator's
Manualinstructions)isopenandallswitchesareon.

NOTE:Ifyourengineisequippedwitha12Vbattery-
operatedelectricstarter,proceedStep5.

IMPORTANT:Whenconnectingthepowercord,always
connectthepowercordtotheswitchboxontheenginefirst;

thenintotheoutlet.

3. Connectthepowercordtotheswitchboxontheengine.

4. Plugendofthepowercordintotheoutlet.

5. Moveenginespeedcontrol,ifequipped,inthe"Fast"
position.

6. Setthechokecontrolto"FULLCHOKE"position.

7. Holdtheprimerbulbinforonefullsecondeachtimeyou
pressit.

Makesureyoucovertheventholewithyour
thumb.

Repeattwiceforatotalofthreeprimes.

IMPORTANT: DO NOT operate an electric starter for more than

5 seconds during each attempt.

NOTE: DO NOT use the primer bulb to restart a warm
engine after a short shutdown. Doing so will flood the
engine and may result in equipment malfunction.

NOTE: If restarting a warm engine after a short shutdown,
move the engine speed control (if equipped) the "FAST"
position and move the choke control to the "NO CHOKE"

position.

8. Push the starter button to start the engine.
NOTE: If the engine fails to start after 3 attempts, repeat

steps 1 through 8.

9. When the engine starts:

Release the starter button.
Move the choke control to 1/2 "CHOKE" position

until the engine runs smoothly.
Next, move the choke control to the NO CHOKE

position.

10.

Move the engine speed control (if equipped) to the desired
speed in the "RUN" range.

NOTE: If the engine starts but falters when the choke
control is moved to the "NO CHOKE" position:

Momentarily move choke control back to "FULL
CHOKE" position.

Next, move the choke control to "!/2 CHOKE"

position until engine runs smoothly.
Finally, move the choke control to the NO

CHOKE position.

If the engine dies after choke control is moved to "NO CHOKE"
position, repeat steps 5 through 10 to restart engine.

11. If the engine fails to start after 3 attempts in the "NO
CHOKE" position, move the choke control to "FULL CHOKE"
position and start engine.

NOTE:When disconnecting the power cord, always
disconnect the power cord from the outlet first; then

disconnect the power cord from the switch box on the
engine.

12. Disconnect the power cord form the outlet.

13. Disconnect the power cord form the switch box on the
engine.

14. If engine does not start after following steps 1 through

12,contact your Authorized MTD Service Dealer. DO NOT

attempt to troubleshoot this engine in any other way.

Engines with Recoil Starters

If you have an electric starter, see Engines with Electric Starters
earlier in this section.

WARNING° DO NOT pull starter rope with engine
running. Doing so may VOID YOUR WARRANTY.

To avoid carbon monoxide poisoning, be sure engine is
outdoors in a well-ventilated area.

2.

Be sure fuel valve, if present (see equipment Operator's
Manual instructions) is open and all switches are on.

3.

Move the engine speed control, if equipped, to the "FAST"
position.

4.

Set the choke control to "FULL CHOKE" position.

5.

Hold the primer bulb in for one full second each time you
press it.

Make sure you cover the vent hole with your
thumb.

Repeat twice for a total of three primes.

NOTE: DO NOT use the primer bulb to restart a warm
engine after a short shutdown. Doing so will flood the
engine and may result in equipment malfunction.

NOTE: If restarting a warm engine after a short shutdown,
move the engine speed control (if equipped) the "FAST"
position and move the choke control to the "NO CHOKE"
position.

6_

Operate equipment control to release engine brake or
clutch, if equipped (see equipment Operator's Manual).

SECTION S -- OPERATION 11

WARNING! When pulling the starter rope, the rope

can unexpectedly jerk back toward the engine
causing serious injury. Toavoid this risk,carefully

follow these instructions:

Grasp the starter cord handle.

Pull rope out slowly until you feel drag.
Without allowing the rope to retract, continue

pulling the rope with one rapid full arm stroke.
Return the rope slowly to the original position.

NOTE:Following the instructions listed in the steps above
avoids potential damage to the recoil mechanism.

NOTE:Ifthe recoil starter handle isfrozen and will not
operate the engine, proceed as follows:

Pull asmuch rope out of the starter as possible.
Releasethe starer handle and let it snap back

against the starter to break up ice';these two
steps should only be done when the starter is

frozen.

8. If the engine fails to start after 3 attempts repeat steps 1
through 7and try again.

9. When the engine starts:

Move the choke control to 1/2 "CHOKE" position
until the engine runs smoothly.

Next, move the choke control to the NO CHOKE
position.

10. Move the engine speed control (if equipped) to the desired
speed in the "RUN" range.

NOTE:If the engine starts but falters when the choke
control is moved to the "NO CHOKE"position:

Momentarily move choke control back to "FULL
CHOKE"position.

Next, move the choke control to "!/2 CHOKE"
position until engine runs smoothly.

Finally, move the choke control to the NO
CHOKEposition.

Ifthe engine dies after choke control is moved to "NO CHOKE"
position, repeat steps 3 through 10to restart engine.

11. If the engine fails to start after 3 attempts in the "NO
CHOKE"position, move the choke control to "FULLCHOKE"
position and start engine.

12. If engine does not start after following steps 1through

11,contact your Authorized MTD Service Dealer. DO NOT

attempt to troubleshoot this engine in any other way.

Stopping the Engine& ShortTermStorage

Stop engine
Manual.

A

equipped.

in accordance with the equipment Operator's

WARNING! To avoid unsupervised engine

operation, especially by children, NEVER leave the
engine unattended while running. Always turn off

the engine after use and remove the ignition key, if

WARNING! NEVERstore the engine with fuel in the
fuel tank inside a building with potential sources of

ignition such ashot water tank and space heaters,
clothes drivers, electric motors, etc.

Stopping TheEngine

1. If operating the engine in the snow or rain, run the engine
for a few minutes to help dry off any moisture.

2. Move the equipment control, if present (see Equipment
Owner's Manual), engine control lever or ignition switch to
"STOP"or "OFF" position.

3. Remove ignition key,if provided (see equipment Operator's
Manual).

NOTE: Removing the key will reduce the possibility of
unauthorized starting of the engine while equipment is not
in use.

WARNING! NEVERstore the engine with fuel in the
fuel tank inside a building with potential sources of

ignition such ashot water tank and space heaters,
clothes dryers, electric motors, etc.

Afterthe

1.

2. Move the equipment control, if present, (see equipment

3. Move the engine choke back and forth several times and

4. Be sure the Fuel Shut-Off Valve,, if present, is off.

EngineisStopped

WARNING! To prevent the possible freeze-up of

engine controls, follow instructions with engine
STOPPED, listed below:

Wipe all snow and moisture from the engine control lever
and choke areas.

Operator's Manual), engine control lever or ignition switch
back and forth several times and leave the control in the

"STOP" or "OFF" position.

leave in the "FULL CHOKE" position.

12 J SECTION 5-- OPERATION

Maintenance

MaintenanceSchedule

6

First S Hours Service Dates

CheckEngineOil Level

Change EngineOil _/ _/

CheckAir Cleaner (If soequipped) V /

Service Air Cleaner (If soequipped) V /

CheckSpark Plug V /

ReplaceSpark Plug V /

Clean Engine Shroud (If so equipped) V '/

Clean around muffler V /

ReplaceFuel Filter (If equipped)

Periodic inspection and adjustment of the engine is essential if
high level performance is to be maintained. Regular maintenance
will also ensure a long service life. The required service intervals

and the kind of maintenance to be performed are described
in the table above. Follow the hourly or calendar intervals,

whichever occur first. More frequent service is required when 1.
operating in adverse conditions.

i_ WARNING! Shut off the engine before performing

NOTE: If engine must be tipped to transport equipment or to
inspect or remove grass, keep spark plug side of engine up.

Transporting or tipping engine spark plug down may cause 2.
smoking, hard starting, spark plug fouling, or oil saturation of air

cleaner. 3.

any maintenance. To prevent accidental start-up,

disconnect the spark plug boot.

EachUseor
EverySHrs.

,/

_1 WARNING! If the engine has been running, themuffler will be very hot. Be careful not to touch the 4.

__ muffler.

Checkingand Changingthe Oil

To avoid engine damage, it is important to:

Check oil level before each use and every 5 operating hours
when the engine is warm.

Change the oil after the first 5 operating hours and every
50 operating hours thereafter. Engine should still be warm

but NOT hot from recent use.

EverySeason

or 25 Hours

EverySeason

or SOHours

EverySeason
or 100 Hours

Oil FillCapand Dipstick

drain oil, drain fuel from tank by running engine

WARNING! Before tipping engine or equipment to

until fuel tank is empty.

Carefully disconnect the spark plug wire and keep it away
from the spark plug. Refer to Fig. 6-1 for spark plug location.

Keep the disconnected spark plug wire securely
away from the metal parts where arcing could

occur.

Carefully attach the spark plug wire to the
grounding post, if provided.

Be sure that the fuel fill cap is on and securely tightened.
Be sure to find correct oil drain plug location, if present

(see the equipment Operator's Manual instructions for
additional information).

Clean area around the oil drain plug.

5.

Place an approved recyclable oil container under the oil
drain plug.

6.

Remove the Oil drain plug. See Fig. 6-2.
NOTE: Depending on which engine model you have, the oil

plug may be positioned differently. These positions include
on the front and/or rear side of the block, or as an extended

tube. Examples are shown in Fig. 6-2.

13

i ii i_,i

12. Fill with the recommended Oil, Fig. 6-3.

(

I

_30

40 mm_.

20w40,_Ow50 ____

15w40, 0_ _ _ _ m_lbl,,.

I

lOw40___lmJbb

I

10w30____

k.

Figure 6-1

Figure 6-2

WARNING! Used motor oil may cause skin cancer if

repeatedly left in contact with the skin for
prolonged periods. Although this is unlikely unless 16.

you handle used oil on a daily basis, it is still
advisable to thoroughly wash your hands with soap 17.

and water as soon as possible after handling used

oil.

7. Tip engine to position the oil flow, so it will drain from the
lowest point on the engine.

8. Drain the oil into an approved recyclable oil container.
NOTE: Please dispose of used motor oil in a manner that is

compatible with the environment. We suggest you take it in a
sealed container to your local service station for reclamation.

Do not throw it in the trash or pour it on the ground.

9. Install the oil drain plug and tighten securely.

10. Clean area around the oil drain plug.

11. Remove the oil fill cap dipstick.

,J

13. Wipe away any spilled oil.

14. Check the oil level by installing the Oil Fill Cap/Dipstick.

15. Remove the oil filler cap/dipstick. If the level is low, slowly

18.

19. Carefully reconnect the spark plug wire to the spark plug.
NOTE: It is advisable to recheck the oil level after you have

operated the engine for a short while, and the normal engine
operating temperature has been achieved.

_ ARNING! If the engine has been running, the

(°F)-20° 0° 200 400 600 800 100°

Fig. 6-3

NOTE: DO NOT overfill oil filler. Doing so may result in oil

carry-over to the equipment and cause malfunction or
damage.

NOTE: DO NOT allow oil level to fall below and "L" mark on
dipstick. Doing so may result in equipment malfunction or

damage.

For threaded Oil Fill Cap/Dipstick models, rest
the cap on the threads, do not tighten down the

cap to check the oil level.
For quarter-turn Oil Fill Cap/Dipstick models,

tighten down the cap to check the oil level.

NOTE:See the Set-Up section earlier in this manual for
detailed instructions on identifying and checking the oil on

each of these specific engine models.

add oil until oil level registers between high (H) and low (L),
Fig. 3-2 and 3-3 in the Set-Up section.

Repeat Steps 14 & 15 to be sure that the correct oil level has
been achieved.

Once the proper oil level has been confirmed, install the Oil
Fill Cap/Dipstick. Tighten securely

Carefully disconnect spark plug wire from grounding post,
if present.

muffler, engine head and spark plug will be very hot.
Be careful not to touch any of these components

until they have cooled.

(°C)-30° -20° -10° 0° 10° 200 300 400

SECTION 6-- MAINTENANCE