MTD 161-JWA-12 Owner’s Manual

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

OperatOr’s Manual

123cc OHV Horizontal Shaft Engine

WARNING

READ AND FOLLOW ALL SAFETY RULES AND INSTRUCTIONS IN THIS MANUAL

BEFORE ATTEMPTING TO OPERATE THIS MACHINE.

FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

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

Printed In USA

Form No. 769-06051F (September 25, 2015)

To The Owner

Thank You

This Operator’s Manual is an important part of your new engine. It will help you prepare and maintain the engine for the best performance. Please read and understand the contents before operating the engine.

Table of Contents

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

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

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

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

Operation ................................................................11

Maintenance ..........................................................14

Troubleshooting .................................................... 20

Replacement Parts .................................................21

Warranty ................................................................ 22

Spanish ................................................................... 24

Record Product Information

Before operating your new engine, please locate the model plate on the engine and record the information in the provided area below. This information will be necessary, should you seek technical support via our web site or with your local dealer.

Model NuMber/Serial NuMber

Customer Support

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

See How-to Maintenance and Parts Installation Videos at www.mtdparts.com/KnowledgeCenter

◊ Call a Customer Support Representative at (800) 800-7310 or (330) 220-4683

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

Important Safe Operation Practices

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 ITS 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.

Training

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 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.

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 neutral (“N”) before starting the engine.

4. Never leave the engine running while unattended.

5. Never attempt to make any adjustments while the engine is running, except where specifically recommended in the operator’s manual.

Safe Handling of Gasoline:

To avoid personal injury or property damage, use extreme 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.

1. When adding fuel, turn engine OFF and let engine cool at least 2 minutes before removing the gas cap.

2. Fill fuel tank outdoors or in well ventilated area.

3. Use only an approved gasoline container.

4. Never fill containers inside a vehicle or on a truck or trailer bed with a plastic liner. Always place containers on the ground away from your vehicle before filling.

5. 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.

6. 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.

7. Do not overfill fuel tank. Fill tank to full as indicated by the fuel level indicator installed inside of the fuel tank. Do not over-fill to allow space for fuel expansion. On some models, a fuel level indicator may NOT be present, in this instance, fill the tank no more than 1/2 inch below the bottom of the filler neck to allow space for fuel expansion.

8. Replace fuel cap and tighten until the cap ratchets.

9. If gasoline is spilled, wipe it off the engine and the equipment. Move the machine to another area. Wait five minutes before starting the engine.

10. To reduce fire hazards, keep the machine free of grass , leaves or other debris build up. Clean up oil or fuel spillage and remove any fuel-soaked debris.

11. Keep gasoline away from sparks, open flames, pilot lights, heat, and other ignition sources.

12. Never fuel equipment indoors because flammable vapors will accumulate in the area.

13. Extinguish all cigarettes, cigars, pipes, and other sources of ignition.

14. Check fuel line, tank, cap, and fittings frequently for cracks or leaks. Replace if necessary.

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 (if not electric start).

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 necessar y.

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.

Do not 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.

Spark Arrestor

WARNING! This machine is equipped with an

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).

If a 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.

4 Section 2 — important 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.

Symbol Description

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.

SAVE THESE INSTRUCTIONS!

5Section 2 — important Safe operation practiceS

Upper Level

Set-Up

Gas & Oil

IMPORTANT: The engine is shipped without gasoline in the

engine. See the following instructions for adding gasoline.

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

Before starting engine, fill with motor oil, capacity is 600 ml/20 oz. Refer to the viscosity chart (Figure 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 classification of a minimum level SJ (higher letter ratings are acceptable such as SL and SM grades). Motor oil will display 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.

Checking Oil Level On Engines with Dipstick on Engine Block

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 near or slightly below the upper level mark on the dipstick or to point of overflow on engines without dipstick. See Figure 3-2.

• Be sure oil fill cap/plug is tightened securely.

1. Remove the oil filler cap/dipstick and wipe the dipstick clean. See Figure 3-2.

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), Figure 3-2.

Figure 3-1

Checking the Oil

This manual covers several different engine models. Instructions for checking the oil with various different oil cap/dipstick configurations follow. Refer to the instructions that pertain to the particular engine model that you have.

Figure 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: some engines are equipped with a dipstick or oil fill plug. NOTE: To change the oil on your engine, see the Maintenance

Section of this manual.

Fill between high and low marks

Checking Oil Level on Engines with Quarter-Turn Oil Fill Caps

Fill

between

high

and low

marks

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 Figure 3-3.

• Be sure oil fill cap/plug is tightened securely when checking.

1. Remove the oil filler cap/dipstick and wipe the dipstick clean. See Figure 3-3.

Checking Oil Level on Engines with Threaded Oil Fill 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 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 Figure 3-4.

• 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.

1. Remove the oil filler cap/dipstick and wipe the dipstick clean. See Figure 3-4.

Figure 3-3

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), Figure 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 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.

Figure 3-4

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), Figure 3-4.

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.

7Section 3 — Set-Up

Filling Oil Sump

Fuel Level Indicator

Top View

1. 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 threaded oil cap/dipstick units, do not screw the cap on to check, just rest cap on threads to gain proper reading. On quarter-turn cap units, tighten down the cap to check the oil level. Refer to the proceeding instructions based on the engine model that you have for more detailed information regarding checking the oil level.

4. Remove the oil fill cap/dipstick from the oil filler tube. Note the oil level and if the oil reading on the dipstick is below the “L” mark, slowly add oil to reach the “H” level.

5. 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.

NOTE: To change the oil, see Checking and Changing Oil instructions in the Maintenance Section of this manual.

Fuel Recommendations

CAUTION: Operating the engine with E15 or E85

fuel, an oil/gasoline mixture, dirty gasoline, or gasoline over 30 days old that hasn’t been fuel stabilizing 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 (E10) 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 E15 or E85 gasoline.

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 NOT use fuel containing Methanol (Wood Alcohol)

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

2. Be sure engine is outdoors and in a well-ventilated area.

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

4. 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 Figure 3-5. All other tanks, fill tank until the fuel reaches a ⁄ inch below the bottom of the filler neck to allow space for fuel expansion. Be careful not to overfill.

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.

8 Section 3— Set-Up

Figure 3-5

5. Replace the fuel cap and tighten securely.

WARNING! 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.

Oil Fill

Fuel Fill

Air Filter

Choke

Recoil Starter

Handle

Oil Fill

Fuel Fill

Air Filter

Choke

Throttle

Oil Drain

Choke

Oil Fill/ Dipstick

Recoil Starter

Handle

Controls and Features

NOTE: Engine models may vary in features and/or location of controls. The following is to serve as a general reference. Always supplement this information with the operator’s manual that is included with the product for more information regarding specific controls and their location.

Choke Control

Activating choke control by sliding it all the way to the right closes the choke plate on carburetor and aids in starting engine. For information on choke usage, see “Starting The Engine”. The image above corresponds with the label on the engine identifying the Choke control.

Recoil Starter & Starter Handle

This motor is fitted with a recoil action pull start and a mitten grip handle for easy access while wearing gloves or mittens.

Figure 4-1

Ignition Key

NOTE: The existence and location of an ignition key may vary by product. Refer to your product operator’s manual for specific key inclusion and/or location information.

Insert the key, if so equipped, and snap it into place; do not turn the key to attempt to start/stop the unit. Pull the key out halfway to stop the engine. Remove key when the unit is not in use.

Oil Fill

On some models the oil fill is located at the top of the engine, as seen in the lower portion of Figure 4-1. On some other models, it is located on the bottom of the engine block as seen in the upper portion of Figure 4-1. Remove oil cap to add oil. Refer to “PreOperation Check” section for checking oil and “Maintaining Your Engine” section for adding oil instructions.

Fuel Cap

The location of the fuel cap may vary based on engine model. On some models, it appears as part of the units shroud, on others, the fuel tank is located on top of the engine. Refer to your product operator’s manual for detailed information regarding the location of the fuel tank. Remove the fuel cap to add fuel. These engines operate on automotive unleaded gas.

Oil Drain

The oil drain is located at the base of the engine block and is used to drain the motor oil from the engine.

Throttle Control

The presence of a throttle control may vary by engine model. If present, it regulates the speed of the engine (Rabbit being the fastest, Turtle being the slowest) and will shut off the engine when pushed to the STOP position.

If a throttle control is not present, then the engine is set to always run at maximum performance speed once started.

10 Section 4— controlS and FeatureS

ChokeRun

Fast Slow/Idle Engine Off

Primer

Operation

Pre-Operation Check

IMPORTANT: The engine is shipped without gasoline in the

engine. See the 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 is very important to check the oil before operating the engine and to add if necessary. See the 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.

WARNING! Improperly maintaining this engine, or

failure to correct any problem before operation can cause a malfunction which could result in serious injury or even death.

Always perform a pre-operation inspection before each operation, and correct any problem.

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

1. Fuel Recommendations (See Set Up Section)

2. Checking Oil Level (See Set Up Section)

3. Air filter (if equipped) (See Maintenance Section)

4. General Overall Inspection. Check for any fluid leaks or discharges, and loose or damaged parts.

5. Check the owner’s manual provided with the equipment that is powered by this engine. Review the owner’s manual for any precautions and procedures that should be followed before starting the engine.

• 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.

NOTE: Familiarize yourself with the engine symbols shown in Figure 5-1 before attempting to start this engine. If this engine is remotely controlled by the equipment it is powering, be sure to familiarize yourself with the equipment Operator’s Manual as well.

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.

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 are experienced and capable of such operation.

WARNING! If you are unable to start this engine

after following instructions in this manual, contact you authorized MTD Service 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 NOT use starting fluid.

• DO NOT spray flammable vapors into the carburetor.

Figure 5-1

Engines With Electric Starters

If you 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 120V A.C. Three-Wire Power Plug designed to operated on a 120V A.C. household current using a standard 3-pronged, grounded extension cord. 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. If your house wiring does not have a G.F.I. Three-

Wire Grounded System, DO NOT USE THIS ELECTRIC STARTER UNDER ANY CONDITION.

c. If your house wiring is grounded and a G.F.I.

three-Prong Wall Receptacle is not available at the location where your starter will be used, one must be installed by a Licensed Electrician BEFORE USING THE ELECTRIC STARTER!

1. 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. Plug an extension cord into the outlet located on the engine’s surface. Plug the other end of extension cord into a three-prong 120-volt, grounded, AC outlet in a wellventilated area.

CAUTION: The extension cord can be any length,

but must be rated for 15 amps at 125 volts, grounded and rated for outdoor use.

IMPORTANT: When connecting the power cord, always

connect the power cord to the switch box on the engine first; then into the outlet.

4. Move engine speed control, if equipped, in the “Fast” position.

5. If equipped, set the choke control to the “FULL CHOKE” position. On units WITHOUT a choke control, a primer bulb will be present. Prime engine 5-7 times.

IMPORTANT: DO NOT operate an electric starter for

more than 5 seconds during each attempt. 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. Push the starter button to start the engine. NOTE: If the engine fails to start after 3 attempts, repeat

steps 1 through 8.

7. 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.

8. 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.

9. 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.

10. Disconnect the power cord form the outlet.

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

12. 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.

1. 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. If equipped, set the choke control to the “FULL CHOKE” position. On units WITHOUT a choke control, a primer bulb will be present. Prime engine 5-7 times.

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.

WARNING! When pulling the starter rope, the

rope can unexpectedly jerk back toward the engine causing serious injury. To avoid this risk, carefully follow these instructions:

12 Section 5— operation

5. 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.

If the recoil starter handle is frozen and will not operate the engine, proceed as follows:

• Pull as much rope out of the starter as possible.

• Release the 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.

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

7. 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.

8. 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 “1/2 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 3 through 10 to restart engine.

9. 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.

10. If engine does not start after following steps 1 through 11, contact your Authorized MTD Service Dealer. DO NOT attempt to troubleshoot this engine in any other way.

Stopping the Engine & Short Term Storage

Stop engine in accordance with the equipment Operator’s Manual.

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 equipped.

WARNING! NEVER store the engine with fuel in the

fuel tank inside a building with potential sources of ignition such as hot water tank and space heaters, clothes drivers, electric motors, etc.

Stopping The Engine

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! NEVER store the engine with fuel in the

fuel tank inside a building with potential sources of ignition such as hot water tank and space heaters, clothes dryers, electric motors, etc.

After the Engine is Stopped

WARNING! To prevent the possible freeze-up of

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

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

2. Move the equipment control, if present, (see equipment Operator’s Manual), engine control lever or ignition switch back and forth several times and leave the control in the “STOP” or “OFF” position.

3. Move the engine choke back and forth several times and leave in the “FULL CHOKE” position.

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

13Section 5 — oper ation

Maintenance

Maintenance Schedule

First 5 Hours

Check Engine Oil Level

Change Engine Oil

Check Air Cleaner (If so equipped)

Service Air Cleaner (If so equipped)

Check Spark Plug

Replace Spark Plug

Clean Engine Shroud (If so equipped)

Clean around muer

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 operating in adverse conditions.

P P

Each Use or Every 5 Hrs.

P P

Every Season

or 25 Hours

Every Season

or 50 Hours

Every Season

or 100 Hours

Service

Dates

WARNING! Shut off the engine before performing

any maintenance. To prevent accidental start-up, disconnect the spark plug boot.

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 smoking, hard starting, spark plug fouling, or oil saturation of air cleaner.

WARNING! If the engine has been running, the

muffler will be very hot. Be careful not to touch the muffler.

Checking and Changing the Engine Oil

Oil Recommendations

Refer to the viscosity chart (Figure 6-1) 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 classification of a minimum level SF or SG (higher letter ratings are acceptable such as SJ, SL and SM grades). Motor oil will display this designation on the container.

Figure 6-1

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

To avoid engine damage, it is important to:

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

Oil

Drain

• Change the oil after the first 5 operating hours and every

Spark Plug

Boot

50 operating hours thereafter. Engine should still be warm but NOT hot from recent use.

Oil Fill Cap/Dipstick

WARNING! Before tipping engine or equipment to

drain oil, drain fuel from tank by running engine until fuel tank is empty.

1. Carefully disconnect the spark plug wire and keep it away from the spark plug. Refer to Figure 6-2 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.

Figure 6-2

2. Be sure that the fuel fill cap is on and securely tightened.

3. Be sure to find correct oil drain plug location, if present (see the equipment Operator’s Manual instructions for additional information).

4. 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 Figure 6-3.

Figure 6-3

WARNING! Used motor oil may cause skin cancer

if repeatedly left in contact with the skin for prolonged periods. Although this is unlikely unless you handle used oil on a daily basis, it is still advisable to thoroughly wash your hands with soap 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.

12. Fill with the recommended Oil. See Figure 6-1. 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.

13. Wipe away any spilled oil.

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

• 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.

15Section 6 — Maintenance

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