Honda CRF110F 2019 Owner's Manual page 84

6. Check the spark plug gap (1) using a
wire-type feeler gauge. If adjustment is
necessary, bend the side electrode (2)
carefully.
The gap should be:
0.8 – 0.9 mm (0.03 – 0.04 in)
(2)
(1) Spark plug gap
(1)
(2) Side electrode
7. Make sure the plug washer is in good
condition.
8. With the plug washer attached, thread
the spark plug in by hand to prevent
cross-threading.
9. Tighten the spark plug:
• If the old plug is good:
1/6 turn after it seats.
• If installing a new plug, tighten it twice
to prevent loosening:
a) First, tighten the plug:
1/4 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/6 turn after it seats.
NOTICE
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.
10. Reinstall the spark plug cap. Take care
to avoid pinching any cables or wires.
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