−
−
0.024
0.028 in (0.60
0.70 mm)
77
Servicing Your Honda
Spark Plug
Improperly tightened spark plugs can damage
the engine. Too loose, you can burn a piston.
Too tight, you can damage the threads.
Tighten the spark plug:
Disconnect the spark plug cap.
Clean any dirt from around the spark plug
base.
Remove the spark plug with a plug wrench.
Inspect the spark plug electrodes for wear.
The center electrode ( ) should have square
edges. The side electrode ( ) should not be
eroded. The insulator should not be cracked
or chipped.
Check the spark plug gap ( ), using a wire-
type feeler gauge. If adjustment is necessary,
bend the side electrode carefully. The gap
should be:
Make sure the plug washer is in good
condition.
If you have to install a new plug, first check
the gap.
With the plug washer attached, thread the
spark plug in by hand (to prevent cross-
threading).
If the old plug is good:
1/8 turn after it seats.
If installing a new plug, tighten it twice to
prevent loosening:
First, tighten the plug:
NGK:
turn after it seats.
DENSO:
turn after it seats.
Then loosen the plug.
Next, tighten the plug again:
1/8 turn after it seats.
Connect the spark plug cap.
2.
3.
4.
5.
6.
7.
3
1
1.
2
a)
b)
c)
3/4
1
8.
05/03/18 15:55:40 31KSJ620_086
