Filter
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1.
Pre-Cleaner Air Filter
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Figure 40. Air Filter Service
REPLACE SPARK PLUG
Service Interval: Yearly
Spark Plug Gap: .030” (.76mm)
1. Stop the engine and allow it to cool.
2. Clean the area around the spark plug.
3. Remove the spark plug.
4. Check the spark plug gap. It should be .030” (see
Figure 41).
5. Reinstall the plug into the cylinder head. Torque the
plug to 180 in. lbs (20 N.m.).
CLEAN COMBUSTION CHAMBER -
BRIGGS & STRATTON MODELS
Service Interval: 100-400 hours
In order to maintain emission compliance, we
recommend that after every 100-400 hours of operation
you have an authorized Briggs & Stratton Service Center
remove combustion deposits from the cylinder, cylinder
head, top of piston, and around the valves.
Figure 41. Spark Plug Gapping
Pre-Cleaner Service
NOTE: Replace a worn or damaged pre-cleaner.
1. Figure 40. Wash the pre-cleaner in liquid detergent
and water.
2. Squeeze the pre-cleaner dry and saturate with
engine oil. Remove all excess oil by squeezing the
pre-cleaner in an absorbent cloth.
Air Filter Service
NOTE: Replace a worn or damaged air filter.
1. Figure 40. If stamped “Washable,” the filter can be
washed with warm water and mild soap.
2. Rinse with tap water with the screen side UP allowing
dirt and debris to filter out.
3. Allow the filter to dry overnight before reinstalling.
26hp
18.5 &
21hp