Honda CH80 2006 Owner's Manual page 110

8. 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
DENSO: 3/4
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.
turn after it seats.
turn after it seats.
9. Reinstall the spark plug cap. Take care
to avoid pinching any cables or wires.
10. Reinstall the left side cover and center
cover (page 82 ).
Servicing Your Honda
Spark Plug
101