Maintenance Schedule - Briggs & Stratton 90000 Operator's Manual

• Do not tamper with governor spring, links or other parts to increase engine speed.
• 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.
• Do not strike the flywheel with a hammer or hard object because the flywheel may
later shatter during operation.
When testing for spark:
• Use approved spark plug tester.
• Do not check for spark with spark plug removed.
Emissions Control Service
Maintenance, replacement, or repair of the emissions control devices and systems
may be performed by any off-road engine repair establishment or individual. However,
to obtain "no charge" emissions control service, the work must be performed by a factory
authorized dealer. See the Emissions Control Statements.

Maintenance Schedule

First 5 Hours
• Change oil
Every 8 Hours or Daily
• Check engine oil level
• Clean area around muffler and controls
• Clean air intake grille
Every 25 Hours or Annually
1
• Service air filter
Every 50 Hours or Annually
• Change engine oil
• Service exhaust system
Annually
• Replace spark plug
• Replace air filter
• Replace pre-cleaner (if equipped)
• Replace fuel filter (if equipped)
• Service fuel system
1
• Service cooling system
2
• Check valve clearance
1
In dusty conditions or when airborne debris is present, clean more often.
2
Not required unless engine performance problems are noted.
Carburetor and Engine Speed
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 Dealer 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 Dealer for assistance. For safe and
proper operation of the equipment, the engine speed should be adjusted only by a
qualified service technician.
Service Spark Plug
See Figure: 8
Check the gap (A, Figure 8) 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.
8
Service Exhaust System
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 and cylinder area. Inspect the muffler for cracks,
corrosion, or other damage. Remove the deflector or the spark arrester, 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.
Change Engine Oil
See Figure: 9, 10, 11, 12
WARNING
Fuel and its vapors are extremely flammable and explosive.
Fire or explosion can cause severe burns or death.
Running engines produce heat. Engine parts, especially muffler, become extremely
hot.
Severe thermal burns can occur on contact.
• 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.
• Allow muffler, engine cylinder and fins to cool before touching.
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
You can drain the oil from the bottom drain hole or from the top oil fill tube.
1. With engine off but still warm, disconnect the spark plug wire (D, Figure 9) and keep
it away from the spark plug (E).
2. Remove the oil drain plug (F, Figure 10). Drain the oil into an approved container.
Note: Any of the oil drain plugs (G, Figure 10) may be installed in the engine.
3. After the oil has drained, install and tighten the oil drain plug (F, Figure 10).
4. When you drain the oil from the top oil fill tube (C, Figure 11), keep the spark plug
(E) end of the engine up. 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.
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