Honda FES125 S-wing, Owner'S Manual, Page: 109 / 418

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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: 1/2 turn after it seats.
DENSO: 1 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
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 thread may be damaged.
9. Reinstall the spark plug cap.
10. Install the remaining parts in the reverse
order of removal.
NOTICE