Honda ARX1500T3DX Owner's Manual page 199

(5)
(5) spark plug gap
5. Inspect the electrodes and center porcelain
for deposits, corrosion, or carbon fouling.
If the corrosion or deposits are heavy,
replace the plug.
6. Make sure that a 1.0 mm wire-type feeler
gauge cannot be inserted between the spark
plug gap (5). If the gauge fits in the gap,
replace the plug with a new one.
7. With the plug washers attached, thread the
spark plugs in by hand to prevent cross-
threading.
8. Tighten each 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:
NGK: 1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
Improperly tightened spark plugs 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.
9. Reinstall the ignition coils and bolts, and
connect the ignition connectors.
10. Install both seats.
Servicing Your Honda
Spark Plugs
191