Racing RAC4000T-A3 Original Instructions Manual page 22

Spark Plug Service
For good performance, the spark plug must be properly gapped and free of deposits.
Disconnect the spark plug cap and remove
any dirt from around the spark plug area.
Remove the spark plug with a spark plug wrench.
Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator is
cracked or chipped.
Measure the spark plug electrode gap with a suitable
gauge. The gap should be 0.028 ~ 0.031 in (0.7 ~ 0.8mm).
Correct the gap, if necessary, by carefully bending the side
electrode with a suitable tool.
Install the spark plug carefully, by hand, to avoid
cross-threading.
Install the spark plug cap on the spark plug.
NOTICE: A loose spark plug can overheat and damage the engine. Over tightening
the spark plug can damage the threads in the cylinder head.
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