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