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6) Spark Plug Service
Recommended spark plugs: F5T or F6TC or F7TJC or other equivalents
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.
1) Remove the spark plug cap.
2) Clean any dirt from around the spark plug base.
3) Use the wrench supplied in the tool kit to remove the spark plug.
4) 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.
5) Measure the plug gap with a feeler gauge. Correct as necessary by carefully bending the
side electrode.
The gap should be: 0.70-0.80 mm (0.028-0.031 in).
6) Check that the spark plug washer is in good condition, and thread the spark plug in by hand
to prevent cross-threading.
7) After the spark plug is seated, tighten with a spark plug wrench to compress the washer. If
installing a new spark plug, tighten I/2 turn after the spark plug seats to compress the washer.
If reinstalling a used spark plug, tighten I/8 -1/4 turn after the spark plug seats to compress the
washer.
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