Honda DREAM125 2018 Owner's Manual page 61

Spark Plug Checking Spark Plug
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5. Check the spark plug gap using a wire-
type feeler gauge.
If adjustment is necessary, bend the
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side electrode carefully.
The gap should be:
0.8 to 0.9 mm (0.03 to 0.04 in)
Spark plug gap
6. Make sure the plug washer is in good
condition.
7. Install the spark plug. With the plug
washer attached, thread the spark plug in
by hand to prevent cross-threading.
56
Side electrode
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.
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: 3/4 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats
NOTICE
9. Install the parts in the reverse order of
removal.
When reinstalling the spark plug cap,
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take care to avoid pinching any cables
or wires.