Maintenance Chart - Briggs & Stratton 90000 Operator's Manual

Maintenance Chart

First 5 Hours
Change Oil

Every 8 Hours or Daily
Check engine oil level

Clean area around muffler and controls

Every 25 Hours or Annually
Clean air filter *

Every 50 Hours or Annually
Change engine oil

Check muffler and spark arrester

Annually
Replace air filter

Replace spark plug

Clean air cooling system *

* In dusty conditions or when airborne debris is present, clean more often.
Carburetor And Engine Speed Adjustment
Never make adjustments to the carburetor or engine speed. The carburetor was set at
the factory to operate efficiently under most conditions. Do not tamper with the governor
spring, linkages, or other parts to change the engine speed. If any adjustments are
required contact a Briggs & Stratton Authorized Service Center for service.
NOTICE: The equipment manufacturer specifies the maximum speed for the engine as
installed on the equipment. Do not exceed this speed. If you are unsure what the
equipment maximum speed is, or what the engine speed is set to from the factory,
contact a Briggs & Stratton Authorized Service Center for assistance. For safe and
proper operation of the equipment, the engine speed should be adjusted only by a
qualified service technician.
How To Replace The Spark Plug - Figure 7
Check the gap (A, Figure 7) with a wire gauge (B). If necessary, reset the gap. Install
and tighten the spark plug to the recommended torque. For gap setting or torque, see the
Specifications section.
Note: In some areas, local law requires using a resistor spark plug to suppress ignition
signals. If this engine was originally equipped with a resistor spark plug, use the same
type for replacement.
Inspect Muffler And Spark Arrester - Figure 8
WARNING
Running engines produce heat. Engine parts, especially muffler,
become extremely hot.
Severe thermal burns can occur on contact.
Combustible debris, such as leaves, grass, brush, etc. can catch fire.
Allow muffler, engine cylinder and fins to cool before touching.

Remove accumulated debris from muffler area and cylinder area.

It is a violation of California Public Resource Code, Section 4442, to use or

operate the engine on any forest-covered, brush-covered, or grass-covered land
unless the exhaust system is equipped with a spark arrester, as defined in
Section 4442, maintained in effective working order. Other states or federal
jurisdictions may have similar laws. Contact the original equipment
manufacturer, retailer, or dealer to obtain a spark arrester designed for the
exhaust system installed on this engine.
Remove accumulated debris from muffler area and cylinder area. Inspect the muffler (A)
for cracks, corrosion, or other damage. Remove the spark arrester (B), if equipped, and
inspect for damage or carbon blockage. If damage is found, install replacement parts
before operating.
WARNING:
Replacement parts must be of the same design and installed
in the same position as the original parts. Other parts may not perform as well, may
damage the unit, and may result in injury.
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How To Change The Oil - Figure 2
WARNING
Fuel and its vapors are extremely flammable and explosive.
Fire or explosion can cause severe burns or death.
When you drain the oil from the top oil fill tube, the fuel tank must be empty or

fuel can leak out and result in a fire or explosion.
Used oil is a hazardous waste product and must be disposed of properly. Do not discard
with household waste. Check with your local authorities, service center, or dealer for safe
disposal/recycling facilities.
Remove Oil
The oil must be drained from the top oil fill tube (E, Figure 10).
1. With engine off but still warm, disconnect the spark plug wire (A) and keep it away
from the spark plug (Figure 9).
2. Remove the dipstick (G, Figure 2).
3. When you drain the oil from the top oil fill tube (E), keep the spark plug end of the
engine (F) up (Figure 10). Drain the oil into an approved container.
WARNING:
When you drain the oil from the top oil fill tube, the fuel tank
must be empty or fuel can leak out and result in a fire or explosion. To empty the fuel
tank, run the engine until it stops from lack of fuel.
Add Oil
Place engine level.

Clean the oil fill area of any debris.

See the Specifications section for oil capacity.

1. Remove the dipstick (G) and wipe with a clean cloth (Figure 2, Figure 3).
2. Pour the oil slowly into the engine oil fill (H). Do not overfill. After adding oil, wait
one minute and then check the oil level.
3. Install and tighten the dipstick.
4. Remove the dipstick and check the oil level. It should be at the top of the full indicator
(J) on the dipstick.
5. Install and tighten the dipstick.
How To Service The Air Filter - Figure 11
WARNING
Fuel and its vapors are extremely flammable and explosive.
Fire or explosion can cause severe burns or death.
Never start or run the engine with the air cleaner assembly (if equipped) or the

air filter (if equipped) removed.
NOTICE: Do not use pressurized air or solvents to clean the filter. Pressurized air can
damage the filter and solvents will dissolve the filter.
Two types of air filter systems are shown, a Standard and a High Capacity. Determine
the type installed on your engine and service as follows.
Standard Air Filter - Figure 11
The standard air filter uses a foam element that can be washed and reused.
1. Remove the screw (A) from the top of the air filter assembly (B). See Figure 11.
2. To prevent debris from falling into the carburetor, carefully remove the air filter
assembly.
3. Remove the foam element (C) from the air filter base.
4. Wash the foam element in liquid detergent and water. Squeeze dry the foam element
in a clean cloth.
5. Saturate the foam element with clean engine oil. To remove the excess engine oil,
squeeze the foam element in a clean cloth.
6. Install the foam element into the air filter base.
7. Install the air filter assembly onto the carburetor and secure with screw.
High Capacity Air Filter - Figure 12
The high capacity air filter uses a pleated filter.
1. Remove the screw (A) from the top of the air filter assembly (B). See Figure 12.
2. To prevent debris from falling into the carburetor, carefully remove the air filter
assembly.
3. Remove the pleated filter (C) from the air filter base.
4. To loosen debris, gently tap the pleated filter on a hard surface. If the pleated filter is
excessively dirty, replace with a new filter.
5. Install the pleated filter.
6. Install the air filter assembly onto the carburetor and secure with screw.
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