Honda CTX700 2016 Owner's Manual page 78

Spark Plug Checking Spark Plug
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7. Install the new spark plugs. With the plug
washers attached, thread the spark plugs
in by hand to prevent cross-threading.
8. Tighten each 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: 2/3 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 lose, a piston may be damaged. If a plug is
too tight, the threads may be damaged.
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9. Reinstall the spark plug caps. Avoid
pinching any cables or wires.