Honda EXW171S Owner's Manual page 34

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 com-
press the washer.
NOTE: If installing a new spark plug, tighten l/2 turn after the spark plug
seats to compress the washer. If reinstalling a used spark plug, tighten
l/8- l/4 turn after the spark plug seats to compress the washer.
CAUTION:
l
The spark plug must be securely tightened. An improperly tightened
plug can become very hot and may cause engine damage.
l
Use only the recommended spark plugs or equivalent. Spark plugs
which have an improper heat range may cause engine damage.
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