Briggs & Stratton 203721GS - Manual (Page 18)

Service Air Cleaner
Your engine will not run properly and may be damaged if
you run it with a dirty air cleaner.
Clean or replace the air cleaner every 25 hours of operation
or once each year, whichever comes first. Clean or replace
more often if operating under dirty or dusty conditions.
To service the air cleaner, follow these steps:
1. Loosen screw (A) and tilt cover (B) down.
2. Remove air cleaner assembly from cover.
3. Carefully separate foam air cleaner (D) from air cleaner
plate (C).
4. Wash foam air cleaner in liquid detergent and water. To
dry, squeeze foam air cleaner in a clean cloth.
5. Saturate foam air cleaner with clean engine oil. To
remove excess oil, squeeze foam air cleaner in a clean
cloth.
6. Reinstall cleaned and oiled foam air cleaner in air
cleaner plate.
7. Firmly fit air cleaner assembly into cover.
8. Insert cover’s tabs (E) into slots (F) in bottom of base (G).
9. Tilt cover up and tighten screw securely to base.
Service Spark Plug
Change the spark plug every 100 hours of operation or once
each year, whichever comes first. This will help your engine
to start easier and run better.
1. Clean area around spark plug.
2. Remove and inspect spark plug.
3. Check electrode gap with wire feeler gauge and set
spark plug gap to 0.030 inch (0.76mm) if necessary.
4. Replace spark plug if electrodes are pitted, burned or
porcelain is cracked. Use the recommended
replacement plug. See Specifications.
5. Install spark plug and tighten firmly.
18 BRIGGSandSTRATTON.COM
NOTICE
DO NOT use pressurized air or solvents to clean the foam
air cleaner.
• Pressurized air can damage the foam air cleaner and solvents
will dissolve the foam air cleaner.
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 or
the foam air cleaner removed.
D
A
B
E
C G
F