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Cleaning the Spark Plug
Recommended spark plug: A7RTC
To ensure proper engine operation, the spark plug must be properly cleaned, gapped, and free of deposits. Clean and
replace the spark plug as recommended in the Maintenance Schedule.
Always use an A7RTC resistor-type spark plug. Using a non-resistor spark plug will interfere with AC output and
the electronics and may prevent the engine from starting.
▲ When replacing a spark plug, always purchase an exact equivalent to the spark plug recommended in this
manual. Using a spark plug with a different number designation could result in overheating and damage the
generator.
The spark plug will last longer in a generator that runs at varying loads. If you always run the generator at the
same load, you will need to replace the spark plug more frequently.
To clean the spark plug:
1. On the top of the generator, remove the screw and the Spark Plug
Access Door
• A screwdriver and a spark plug wrench are provided with the
generator.
• Use the screwdriver as a handle when inserted through a side
hole in the spark plug wrench.
2. Remove the spark plug cap.
3. Clean any dirt from around the spark plug base.
4. Use the screwdriver with the spark plug wrench to loosen and
remove the spark plug.
5. Visually inspect and clean the spark plug. If the insulator is cracked or
chipped, or if the electrode has excessive wear, discard and replace
the spark plug.
6. Clean the spark plug with a wire brush.
7. Measure the plug gap with a feeler gauge. The gap should be 0.024-
0.028 in. (0.6-0.7mm). Adjust the gap as needed by carefully bending
the side electrode.
8. Reinstall the spark plug carefully.
a. To avoid cross-threading, start threading by hand.
b. After seating the spark plug by hand, use the spark plug wrench
with the screwdriver to tighten the spark plug by 1/8 to 1/4 turn.
(For a new spark plug, tighten by a 1/2 turn in order to adequately
compress the gasket.)
▲ The spark plug must be correctly and securely seated to avoid loss of spark or damage to the generator.
9. Put the spark plug cap back on the spark plug securely.
10. Reinstall the spark plug access door and screw back onto the generator.
0.024-0.028”
(0.6-0.7mm)
Spark Plug Wrench
Spark Plug Cap
Screwdriver
Maintenance Schedule
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