Sparkplugs - Honda HA4120H48A Owner's Manual

MAINTENANCE
Spark Plugs
Removal, Inspection and Replacement
For good performance, the spark plugs should have the correct gap
and be free of deposits. Follow these steps for each spark plug.
1. Remove the spark plug cap. Clean
any dirt from around the spark plug
base. Use the wrench supplied to
remove the spark plug.
2. Visually inspect the spark plug.
Discard it if the insulator is cracked or
chipped. Clean the spark plug with a
wire brush if it is to be reused.
3. New plugs should be NGK: BPR5ES or ND: WlGEPR-U.
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Spark plugs of the wrong size or incorrect heat range can cause
engine damage
4. Measure the plug gap with a feeler
gauge. Correct as necessary by carefully
+.
/
bending the side electrode. The gap
should be:
0.028 to 0.031 inch (0.70 to 0.80 mm)
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.
5. Check that the spark plug washer is in good condition and thread
the spark plug in by hand to prevent cross threading.
6. After the spark plug is seated, tighten with the spark plug wrench to
compress the washer.
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If installing a new spark plug, tighten l/2 turn after the plug
seats to compress the washer.
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If reinstalling a used spark plug, tighten l/8 to l/4 turn after
plug seats to compress the washer.
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The spark plug must be securely tightened. An improperly tightened
spark plug can become very hot and may cause engine damage.
Use only the recommended spark plug or equivalent. A spark plug
which has an improper heat range may cause engine damage.
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