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Servicing Your Honda
152
Spark Plug
6.
Discard the spark plug if there is apparent wear or if the insulator
is cracked or chipped.
7.
Using a wire-type feeler gauge, check the spark plug gap (4). If
adjustment is necessary, bend the side electrode carefully.
The gap should be:
0.039 – 0.043 in (1.00 – 1.10 mm)
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:
1/8 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:
1/8 turn after it seats.
NGK: 3/4 turn after it seats.
DENSO: 1/2 turn after it seats.
(1) spark plug cap
(2) center electrode
(3) side electrode
(4) spark plug gap
0.039 – 0.043 in
(1.00 – 1.10 mm)
LEFT SIDE
(1)
(2)
(3)
(4)
19MY TRX420FE1 31HR3850.book Page 152 Tuesday, April 3, 2018 10:51 AM
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