Honda VTX1300T 2009 Owner's Manual page 126

Spark Plugs
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: 3/4
DENSO: 1/2
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
Improperly tightened spark plugs 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.
118
Servicing Your Honda
turn after it seats.
turn after it seats.
9. Reinstall the spark plug caps. Take care
to avoid pinching any cables or wires.
10. Reinstall the overhead covers (page 116 ).