Replace spark plug, Clean combustion chamber – Craftsman 107.289920 User Manual

Page 30

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REPLACE SPARK PLUG

Service Interval: Every 100 hours.

Replacement Spark Plug: 491055S

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” (.76

mm) (see Figure 35).

5. Reinstall the plug into the cylinder head. Tighten the

plug to 180 in-lbs (20 Nm).

.030”
(.76 mm)

CLEAN COMBUSTION CHAMBER

Service Interval: 100-400 hours

In order to maintain emission compliance, we recom
mend that after every 100-400 hours of operation that

you have an authorized Briggs & Stratton or Sears

Service Center remove combustion deposits from the

cylinder, cylinder head, top of piston, and around the

valves.