2-6 PERIODIC MAINTENANCE
0.5 – 0.6 mm
(0.020 – 0.024 in)
SPARK PLUG
Clean every 3 months.
Replace every 6 months.
Neglecting the spark plug maintenance will eventually leads to
difficult starting and poor engine performance. If the spark plug is
used for a long period, the electrode gradually burns away and
carbon builds up along the inside part of the spark plug. In accor-
dance with the Periodic Maintenance chart, the spark plug should
be inspected, cleaned and regapped at the recommended inter-
vals.
• Disconnect the spark plug cap 1 and remove the spark plug
2.
# 09930-10121: Spark plug socket wrench set
• Carbon deposits on the spark plug will prevent good sparking
and may cause the engine to misfire. Be sure to clean the car-
bon deposits off periodically.
• If the center electrode is fairly worn down, the spark plug should
be replaced and the spark plug gap set to the specification us-
ing a thickness gauge.
# 09900-20804: Thickness gauge
$ Spark plug gap: 0.5 – 0.6 mm (0.020 – 0.024 in)
• Check the spark plug for burns. If any abnormalities are found,
replace the spark plug as indicated below.
NGK
STD BPR4H
!
Confirm the thread size and reach when replacing the
spark plug. If the reach is too short, carbon will be de-
posited on the screw portion of the plug hole and engine
damage may result.
!
Before using a spark plug wrench, carefully turn the spark
plug by finger into the threads of the cylinder head to
prevent damage.
• Tighten the spark plug to the using the special tool.
# 09930-10121: Spark plug socket wrench set
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