Product Manual

Spark Plug Service
To ensure proper engine operation, the spark plug must be properly gapped and free of deposits. If
the engine has been running, the muffler will be very hot. Be careful not to touch the muffler.
 Remove spark plug cap.
 Clean any dirt from around the spark plug base.
 Use a spark plug wrench to remove the spark plug.
 Visually inspect the spark plug. Discard it if the insulator is
cracked, chipped or fouled.
 Measure the plug gap with a feeler gauge. Correct as
necessary by carefully bending the side electrode.
The gap should be: 0.028 0.031 inches (0.70 0.80 mm)
 Check that the spark plug washer is in good condition. Thread the spark plug in by hand to
prevent cross-threading.
 After the spark plug is seated, tighten with the spark plug wrench to compress the washer.
• If installing a new spark plug, tighten ½ turn after the spark plug seats to compress the
washer. If reinstalling a used spark plug, tighten ⅛ - ¼ turn after the spark plug seats to
compress the washer.
Caution: The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and could damage the engine.
Never use spark plugs which have an improper heat range. Use only
recommended spark plugs or equivalent.
Spark Arrester Maintenance
If the generator has been running, the muffler will be very hot. Allow it to cool before proceeding.
The spark arrester must be serviced every 100 hours to maintain its efficiency.
Clean the spark arrester as follows:
 Loosen the screw by the exhaust port of the muffler and remove the
spark arrester.

Use a brush to remove carbon deposits from the spark arrester screen.
Inspect the screen for breaks or tears and replace it if necessary.
 Install the spark arrester in the reverse order of removal.
INSPECTION, CLEANING AND MAINTENANCE
WARNING! ALWAYS MAKE SURE THE ENGINE POWER
SWITCH IS IN ITS “OFF” POSITION. DISCONNECT THE SPARK
PLUG WIRE FROM THE ENGINE. AND ALLOW SUFFICIENT
TIME FOR THE ENGINE AND GENERATOR TO COMPLETELY
COOL BEFORE PERFORMING ANY INSPECTIONS,
MAINTENANCE OR CLEANING.
 Before each use, inspect the generator. Check for:
• Loose screws
• Misaligned or bound moving parts
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