HONDA TRX420TE/FE - Manual (Page 144)

136
Spark Plug
Servicing Your Honda
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.
With the plug washer attached, thread the spark plug in by hand to
prevent cross-threading.
Tighten the spark plug:
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.
If the old plug is good:
1/8 turn after it seats.
If installing a new plug, tighten it twice to prevent loosening:
Connect the spark plug cap. Take care to avoid pinching any cables or
wires.
Install the remaining parts in the reverse order of removal.
a)
b)
c)
3/4
1/2
9.
10.
11.
12.
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