Replace Spark Plug; Clean Combustion Chamber - Murray E20M42 Operator's Manual

Pre-Cleaner Service
NOTE: Replace a worn or damaged pre-cleaner.
1. Figure 30. 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 30. 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.

REPLACE SPARK PLUG

Service Interval: Yearly.
Spark Plug Gap: 0.030" (0.76 mm)
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 0.030"
(0,76 mm) (see Figure 31).
5. Reinstall the plug into the cylinder head. Torque the
plug to 180 in. lbs. (20 Nm).
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.
26
Pre-Cleaner
1.
2.
Figure 30. Air Filter Service
Figure 31. Spark Plug Gapping
Air Filter
1.
2.
0.030"
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