Honda NC750X 2018 Owner's Manual page 106

Spark Plug Checking Spark Plug
u
Make sure the plug washer is in good
7.
condition.
Install the spark plugs. With the plug
8.
washers attached, thread the spark plugs
in by hand to prevent cross-threading.
Tighten the spark plug:
9.
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:
2/3 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
An 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.
102
Install the parts in the reverse order of
10.
removal.
When reinstalling the spark plug caps,
u
take care to avoid pinching any cables
or wires.
Install the parts in the reverse order of
11.
removal.