23041-135-B0-001 Rev. A (07/2013)
3.0 Servicing, continued
3.5 Spark Plug Maintenance
To ensure proper engine operation, the spark plug must be in good repair and properly gapped. Replace
and properly gap the spark plug per the following procedure.
Tools Required:
#2 Philips Head Screwdriver
A7RTC Resistor-type Spark Plug
Procedure:
1. Remove the spark plug access cover.
2. Remove the spark plug cap.
3. Clean any dirt from around the spark plug base.
4. Use the supplied wrench to remove the spark plug.
5. Visually inspect the spark plug. Discard it if the insulator is cracked or chipped. Clean the spark plug
with a wire brush if it is to be reused.
6. Measure the plug gap with a feeler gauge.
7. The gap should be 0.024-0.028in (0.6-0.7mm). Correct as necessary by carefully bending the side
electrode.
8. Install the spark plug carefully, by hand, to avoid cross-threading.
9. After a new spark plug has been seated by hand, it should be tightened 1/2 turn with a wrench to
compress its washer. If a used plug is being reinstalled, it should only require 1/8 to 1/4 turn after being
seated.
10. Reinstall the spark plug cap on the spark plug securely.
11. Reinstall the spark plug maintenance cover.
The spark plug must be securely tightened. An improperly tightened plug can become very hot and possibly
damage the generator. Never use a spark plug with an improper heat range. Always use an A7RTC resistor-type
spark plug. Using a non-resistor spark plug will interfere with AC output.
CAUTION!
Fig. 3-4, Spark Plug Maintenance
Spark Plug
Access Cover
Captive Screw
Spark Plug
Wrench
Spark Plug
Cap
