Honda 2013 NSS300 Owner's Manual page 69

Spark Plug Checking & Changing Spark Plug
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10. Make sure the plug washer is in good
condition.
11. With the plug washer attached, thread
the spark plug in by hand to prevent
cross-threading.
12. Tighten the spark plug:
●
If the old plug is good:
1/8 turn after it seats
●
If installing a new plug, tighten it twice
to prevent loosening:
a) First, tighten the plug:
NGK: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
Improperly tightened spark plug can damage the engine.
If a plug is too loose, a piston may be damaged. If a plug
is too tight, the threads may be damaged.
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13. Reinstall the spark plug cap. Take care
avoid pinching any cables or wires.
14. Install the parts in the reverse order of
removal.