Honda SH300A 2015 Owner's Manual page 79

6. Check the spark plug gap using a
wiretype feeler gauge.
u If adjustment is necessary, bend the
side electrode carefully.
The gap should be:
0.8 to 0.9 mm (0.03 to 0.04 in)
Spark plug gap
7. Make sure the plug washer is in good
condition.
8. Install the new spark plug. 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:
1/8 turn after it seats
●
If installing a new plug, tighten it twice
to prevent loosening:
a) First, tighten the plug:
b) Then loosen the plug.
c) Next, tighten the plug again:
Side
electrode
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.
10. Reinstall the spark plug cap. Take care
avoid pinching any cables or wires.
11. Install the parts in the reverse order of
removal.
Spark Plug u Checking Spark Plug
1/2 turn after it seats.
1/8 turn after it seats.
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