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How To Change The Oil - Figure
7 8
CAUTION: Used oil is a hazardous waste product and must be disposed of properly. Do
not discard withhousehold waste. Check with your local authorities, service center, or
dealer for s afe disposal/recycling f acilities.
Remove Oil
1. With engine off but still warm, disconnect the spark plug wire (A) and keep it away
from the spark plug (Figure 7).
2. Remove the oil drain plug (B, Figure 8). Drain the oil into an approved receptacle.
Note: Any of the oil drain plugs (C) shown may be installed in the engine.
3. After the oil has drained, install and tighten the oil drain plug.
Add oil
• Place engine level.
• Clean the oil fill area of any debris.
• See the Specifications section for oil capacity.
1. Remove the oil fill cap (D, Figure 8).
2. Pour the oil slowly into theengine oil fill (E). Fill to point of overflowing.
3. Replace and tighten the oil fill cap.
How To Service The Air Filter - Figure
9 10
WARNING
Gasoline and its vapors are extremely flammable and explosive.
Fire or explosioncan cause severe burns or death.
• Never start or run the engine with the air cleaner assembly or the air filter removed.
CAUTION: Do not use pressurized air or solvents to clean the filter. Pressurized air can
damage the f ilter and solvents will dissolve the filter.
The air cleaner system uses a pleated filter with an optional pre-cleaner. The pre-cleaner
can be washed and reused.
1. Push in the locking tabs (A) and pull off the cover (B).SeeFigure9.
2. Remove the filter (D). See Figure 10.
3. To loosen debris, gently tap the filter on a hard surface. If the filter is excessively
dirty, replace with a new filter.
4. Push the end of the filter into the base as shown. Make sure filter fits securely in the
base.
5. Install the cover. Make sure both locking tabs are secure.
How To Change The Gear Reduction Oil - Figure
11
If your engine is equipped with a gear reduction unit, service as follows.
1. Remove the oil fill plug (B) and the oil level plug (C).
2. Remove the oil drain plug (A, Figure 11) and drain the oil into an appropriate
receptacle.
3. Install and tighten the oil drain plug.
4. To refill, slowly pour gear lube into the oil fill hole (see Specifications section).
Continue to pour until the oil runs out of the oil level hole.
5. Install and tighten the oil level plug.
6. Install and tighten the oil fill plug.
Important: The oil fill plug has a vent hole (D) and must be installed on the top of the
gear case cover as shown.
How To Clean The Air Cooling System - Figure
12
Running engines produce heat. Engine parts, especially muffler, become
extremely hot.
Severe thermal burns can occur on contact.
Combustible debris, suchas leaves, grass, brush, etc. can catch fire.
WARNING
• Allow muffler, engine cylinder and fins to cool before touching.
• Remove accumulated debris from muffler area and cylinder area.
CAUTION: Do not use water to clean the engine. Water could contaminate the fuel
system. Use a brush or dry cloth to clean the engine.
This is an air cooled engine. Dirt ordebris can restrict air flow and cause the engine to
overheat, resulting inpoor performance and reduced engine life.
Use a brush or dry cloth to remove debris from the finger guard (A) (Figure 12). Keep
linkage, springs and controls (B) clean. Keep the area around and behindthe muffler (C)
free of any combustible debris.
Storage
WARNING
Gasoline and its vapors are extremely flammable and explosive.
Fire or explosioncan cause severe burns or death.
When Storing Gasoline Or Equipment With Fuel In Tank
• Store away from furnaces, stoves, water heaters or other appliances that have pilot
lights or other ignition sources because they can ignite gasoline vapors.
Fuel System
Fuel can become stale when stored over 30 days. Stalefuel causes acid and gum
deposits to form in the fuel systemor on essential carburetor parts. To keep fuel fresh,
use Briggs &Stratton FRESH START
®
fuel stabilizer, available as a liquid additive or a
drip concentrate cartridge.
There is no need to drain gasoline from the engine if a fuel stabilizer is addedaccording
to instructions. Run the enginefor 2 minutes to circulate the stabilizer throughout the fuel
system. The engine and fuel can then be stored up to 24 months.
If gasoline in the engine has notbeen treated with a fuel stabilizer,it must be drained into
an approved container. Run the engine until it stops from lack of fuel. The use of a fuel
stabilizer in the storage container is recommended to maintain freshness.
Engine Oil
While the engine is still warm, change the engine oil.
Troubleshooting
Need Assistance? Go to BRIGGSandSTRATTON.COM or call 1-800-233-3723.
Specifications
Engine Specifications
Model 90000
Displacement 9.02 ci (148 cc)
Bore 2.562 in (65.08 mm)
Stroke 1.750 in (44.45 mm)
Oil Capacity 18 -- 20 oz (0.54 -- 0.59 L)
Gear Reduction Oil 80W-90
Tune-up Specifications *
Model 90000
Spark Plug Gap 0.030 in (0.76 mm)
Spark Plug Torque 180 lb-in (20 Nm)
Armature Air Gap 0.006 - 0.010 in (0.15 - 0.25 mm)
Intake Valve Clearance 0.005 - 0.007 in (0.13 - 0.18 mm)
Exhaust Valve Clearance 0.007 - 0.009 in (0.18 - 0.23 mm)
* Engine power will decrease 3.5% for each 1,000 feet (300 meters) above sea leveland
1% for each 10° F(5.6° C) above 77° F(25° C). The engine will operate satisfactorily at
an angle up to 15°. Refer to the equipment operator’s manual for safe allowable
operating limits on slopes.
Common Service Parts n
Service Part Part Number
Oval Air Filter 790166
Fuel Additive 5041, 5058
Resistor Spark Plug 802592
Long Life Platinum Spark Plug 5062
Spark Plug Wrench 89838, 5023
Spark Tester 19368
n We recommend that you see any Briggs & Stratton Authorized Dealer for all
maintenance and service of the engine and engine parts. Use only genuine Briggs &
Stratton parts.