Honda CG125 Fan Owner's Manual page 121

48
3. Inspect the electrodes and center porcelain for
deposits, erosion or carbon fouling. If the erosion or
deposit is heavy, replace the plug. Clean a carbon
or wet fouled plug with a plug cleaner, otherwise use
a wire brush.
4. Check the spark plug gap (3) using a wire-type
feeler gauge. If adjustment is necessary, bend the
side electrode (4) carefully.
The gap should be: 0.8 – 0.9 mm (0.03 – 0.04 in)
5. Make sure the plug washer is in good condition.
(4)
(3) Spark plug gap
(4) Side electrode
(3)
6. With the plug washer attached, thread the spark
plug in by hand to prevent cross-threading.
7. 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: 3/4 turn after it seats.
DENSO: 1/2 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 loose, a piston may be damaged. If a plug
is too tight, the threads may be damaged.
8. Reinstall the spark plug cap.
Owner´s Manual