Briggs&Stratton 400000: Not for Reproduction

Carburetor Adjustment

6. Start and run the engine. As the engine warms up, check for oil leaks.

Never make adjustments to the carburetor. The carburetor was set at the factory to

7. Stop the engine and check the oil level. It should be at the FULL mark on the

operate efficiently under most conditions. However, if adjustments are required, see a

dipstick.

Briggs & Stratton Authorized Dealer for service.

Add Oil

NOTICE: The manufacturer of the equipment on which this engine is installed specifies

the top speed at which the engine will be operated. Do not exceed this speed.

• Place engine level.

• Clean the oil fill area of any debris.

• See the Specifications section for oil capacity.

How To Replace The Spark Plug - Figure

5

1. Remove the dipstick (D) and wipe with a clean cloth (Figure 6).

Check the gap (A, Figure 5) with a wire gauge (B). If necessary, reset the gap. Install

2. Pour the oil slowly into the engine oil fill (E). Do not overfill. After adding oil, wait

and tighten the spark plug to the recommended torque. For gap setting or torque, see the

one minute and then check the oil level.

Specifications section.

3. Install and tighten the dipstick.

Note: In some areas, local law requires using a resistor spark plug to suppress ignition

4. Remove the dipstick and check the oil level. It should be at the FULL mark (F)onthe

signals. If this engine was originally equipped with a resistor spark plug, use the same

dipstick.

type for replacement.

5. Install and tighten the dipstick.

Inspect Muffler And Spark Arrester

How To Service The Air Filter - Figure

8 9

WARNING

WARNING

Running engines produce heat. Engine parts, especially muffler,

Fuel and its vapors are extremely flammable and explosive.

become extremely hot.

Fire or explosion can cause severe burns or death.

Severe thermal burns can occur on contact.

Combustible debris, such as leaves, grass, brush, etc. can catch fire.

• Never start or run t he engine with the air cleaner assembly (if equipped) or the

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

air filter (if equipped) removed.

• Remove accumulated debris from muffler area and cylinder area.

• It is a violation of California Public Resource Code, Section 4442, to use or

NOTICE: Do not use pressurized air or solvents to clean the filter. Pressurized air can

operate the engine on any forest -covered, brush-covered, or grass-covered land

damage the filter and solvents will dissolve the filter.

unless the exhaust system is equipped with a spark arrester, as defined in

The air filter system uses either a flat or oval cartridge. Some models are also equipped

Section 4442, maintained in effective working order. Other states or federal

with a pre-cleaner that can be washed and reused.

jurisdictions may have similar laws. Contact the original equipment

manufacturer, retailer, or dealer to obtain a spark arrester designed for the

Flat Air Filter

exhaust system installed on this engine.

1. Remove the cover (A, Figure 8).

2. Remove the filter (C) and the pre-cleaner (B).

Exhaust system parts are installed by the equipment manufacturer. For specific

3. To loosen debris, gently tap the filter on a hard surface. If the filter is excessively

maintenance and replacement information, contact the equipment manufacturer.

dirty, replace with a new filter.

Inspect the muffler for cracks, corrosion, or other damage. Remove the spark arrester, if

4. Wash the pre-cleaner in liquid detergent and water. Then allow it to thoroughly air

equipped, and inspect for damage or carbon blockage. If replacement parts are required,

dry. Do not oil the pre-cleaner.

make sure to use only original equipment replacement parts.

5. Assemble the dry pre-cleaner and the filter into the engine base (D).

6. Install the cover.

WARNING: Replacement parts must be the same and installed in the

Oval Air Filter

same position as the original parts or fire could result.

1. Remove the cover (A, Figure 9).

2. To remove the filter (B), lift the end of the filter.

3. Remove the pre-cleaner (C), if equipped, from the filter.

How To Change The Oil - Figure

6 7

4. To loosen debris, gently tap the filter on a hard surface. If the filter is excessively

dirty, replace with a new filter.

Used oil is a hazardous waste product and must be disposed of properly. Do not discard

5. Wash the pre-cleaner in liquid detergent and water. Then allow it to thoroughly air

with household waste. Check with your local authorities, service center, or dealer for safe

dry. Do not oil the pre-cleaner.

disposal/ recycling facilities.

6. Assemble the dry pre-cleaner to the filter.

Remove Oil

7. Install the filter into the engine base (D) and push down until the filter snaps in place.

1. With engine off but still warm, disconnect the spark plug wire (A) and keep it away

8. Install the cover.

from the spark plug (Figure 6).

2. Remove the dipstick (D).

How To Replace The Fuel Filter - Figure

10

Standard Oil Drain Plug

1. Remove the oil drain plug (B). Drain the oil into an approved container.

Note: Any of the oil drain plugs shown below may be installed in the engine.

WARNING

Fuel and its vapors are extremely flammable and explosive.

Fire or explosion can cause severe burns or death.

2. After the oil has drained, install and tighten the oil drain plug.

Optional Quick Oil Drain

• Keep fuel away from sparks, open flames, pilot lights, heat, and other ignition

1. Disconnect the oil drain hose (G, Figure 6) from the side of the engine.

sources.

2. Turn and remove the oil drain cap (H). Carefully lower the quick oil drain (I)intoan

• Check fuel lines, tank, cap, and fittings frequently for cracks or leaks.

approved container (J).

Replace if necessary.

3. After the oil has drained, install the oil drain cap. Attach the oil drain hose t o the side

• Before replacing the fuel filter, drain the fuel tank or close the fuel shut-off valve.

of the engine.

• Replacement parts must be the s ame and installed in the same position as the

original parts.

Change The Oil Filter (if equipped)

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

For replacement intervals, see t he Maintenance chart.

1. Drain the oil from the engine. See Remove Oil section.

1. Before replacing the fuel filter (A, Figure 10), if equipped, drain the fuel tank or close

2. Remove the oil filter (C) and dispose of properly. See Figure 7.

the fuel shut-off valve. Otherwise, fuel can leak out and cause a fire or explosion.

3. Before you install the new oil filter, lightly lubricate the oil filter gasket with fresh,

2. Use pliers to squeeze tabs (B) on t he clamps (C), then slide the clamps away from

clean oil.

the fuel filter. Twist and pull the fuel lines (D) off of the fuel filter.

4. Install the oil filter by hand until the gasket contacts the oil filter adapter, then tighten

3. Check the fuel lines for cracks or leaks. Replace if necessary.

theoilfilter1/2to3/4turns.

4. Replace the fuel filter with an original equipment replacement filter.

5. Add oil. See Add Oil section.

5. Secure the fuel lines with the clamps as shown.

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BRIGGSandSTRATTON.COM

How To Clean The Air Cooling System - Figure

11

Specifications

Engine Specifications

Model 400000

WARNING

Displacement 40.03 ci (656 cc)

Running engines produce heat. Engine parts, especially muffler,

Bore 2.970 in (75.43 mm)

become extremely hot.

Stroke 2.890 in (73.41 mm)

Severe thermal burns can occur on contact.

Oil Capacity 62 -- 64 oz (1.8 -- 1.9 L)

Combustible debris, such as leaves, grass, brush, etc. can catch fire.

Engine Specifications

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

• Remove accumulated debris from muffler area and cylinder area.

Model 440000

Displacement 44.18 ci (724 cc)

Bore 3.120 in (79.24 mm)

NOTICE: Do not use water to clean the engine. Water could contaminate the fuel

system. Use a brush or dry cloth to clean the engine.

Stroke 2.890 in (73.41 mm)

This is an air c ooled engine. Dirt or debris can restrict air flow and cause the engine to

Oil Capacity 62 -- 64 oz (1.8 -- 1.9 L)

overheat, resulting in poor performance and reduced engine life.

Engine Specifications

Use a brush or dry cloth to remove debris from the finger guard/rotating screen (A).

Keep linkage, springs and controls (B) clean. Keep the area around and behind the

Model 490000

muffler free of any combustible debris (Figure 11). Make sure the oil cooler fins (C)are

Displacement 49.42 ci (810 cc)

free of dirt and debris.

Bore 3.300 in (83.81 mm)

Stroke 2.890 in (73.41 mm)

Oil Capacity 66 -- 68 oz (1.9 -- 2.0 L)

Storage

Tune-up Specifications *

Model 400000, 440000, 490000

Spark Plug Gap 0.030 in (0.76 mm)

WARNING

Spark Plug Torque 180 lb-in (20 Nm)

Fuel and its vapors are extremely flammable and explosive.

Armature Air Gap 0.008 - 0.012 in (0.20 - 0.30 mm)

Fire or explosion can cause severe burns or death.

Intake Valve Clearance 0.004 - 0.006 in (0.10 - 0.15 mm)

Exhaust Valve Clearance 0.004 - 0.006 in (0.10 - 0.15 mm)

When Storing Fuel Or Equipment With Fuel In Tank

* Engine power will decrease 3.5% for each 1,000 feet (300 meters) above sea level and

• Store away from furnaces, stoves, water heaters or other appliances that have

1% for each 10° F(5.6° C) above 77° F(25° C). The engine will operate satisfactorily at

pilot lights or other ignition sources because they can ignite fuel vapors.

an angle up to 15°. Refer to the equipment operator’s manual for safe allowable

operating limits on s lopes.

Fuel System

Common Service Parts n

Fuel can become stale when stored over 30 days. Stale fuel causes acid and gum

Service Part Part Number

deposits to form in the fuel system or on essential carburetor parts. To keep fuel fresh,

Air Filter, Flat 499486

use Briggs & Stratton FRESH START

®

fuel stabilizer, available as a liquid additive or a

drip concentrate cartridge.

Air Filter Pre-cleaner, Flat 273638

There is no need to drain gasoline from the engine if a fuel stabilizer is added according

Air Filter, Oval 792105

to instructions. Run the engine for 2 minutes to circulate the stabilizer throughout the fuel

Air Filter Pre-cleaner, Oval 792303

system. The engine and fuel can then be stored up to 24 months.

Oil -- SAE 30 100028

If gasoline in the engine has not been treated with a fuel stabilizer, it must be drained into

Oil Filter 492932

an approved container. Run the engine until it stops from lack of fuel. The use of a fuel

Fuel Filter 691035

stabilizer in the storage container is recommended to maintain freshness.

Fuel Additive 5041, 5058

Engine Oil

Resistor Spark Plug 491055

While the engine is still warm, change the engine oil. See the How To Change The Oil

Long Life Platinum Spark Plug 5066

section.

Spark Plug Wrench 19374

Spark Tester 19368

n We recommend that you see any Briggs & Stratton Authorized Dealer for all

Troubleshooting

maintenance and service of the engine and engine parts. Use only genuine Briggs &

Need Assistance? Go to BRIGGSandSTRATTON.COM or call 1-800-233-3723.

Stratton parts.

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