Spark Plugs - Honda Outdoor Motor BF40A Owner's Manual

10. MAINTENANCE
Spark Plugs
To ensure proper engine operation, the
spark plugs must be properly gapped
and free of deposits.
Check-replace interval:
After the first 20 hours, then every
200 hours. (Refer to the mainte-
nance schedule page 77).
Recommended spark plug:
DR7EA (NGK),
X22ESR-U (NIPPON DENSO)
Use only the recommended spark
plugs or equivalent.
-1 Spark plugs which have
an improper heat range may cause
engine damage.
1. Allow the engine to cool. The spark
plugs will be hot if the engine has
been running.
2. Remove the engine cover.
PLUG CAPS
- v
3. Disconnect the spark plug caps
from the spark plugs.
4. Use the wrench and screwdriver
supplied in the tool kit to remove
the spark plugs.
5. Check the spark plugs. Replace the
spark plugs if there is apparent
wear, or if the insulators are
cracked or chipped. Clean the spark
*plugs with a wire brush if they are
to be reused.
: 0.024-0.028 in
(0.6-0.7
mm)
6. Measure the plug gaps with a spark
plug gap gauge.
The gaps should be 0.024-0.028 in
(0.6-0.7 mm). Correct as necessary
by carefully bending the side elec-
trode.
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