Honda BF75D Owner's Manual page 133

MAINTENANCE
SIDE ELECTRODE
–
0.8 0.9 mm
(0.031
SEALING
WASHER
INSULATOR
7. Measure the plug gaps with a
wire-type feeler gauge.
The gaps should be 0.8 – 0.9 mm
(0.031 – 0.035 in). Correct as
necessary by carefully bending
the side electrode.
8. Thread the plugs in by hand to
prevent cross threading.
9. After the spark plugs are seated,
tighten with a spark plug wrench
to compress the washers.
132
If installing new spark plugs, tighten
1/2 turn after the spark plugs seat to
compress the washers.
–
0.035 in)
If reinstalling used spark plugs,
tighten 1/8 – 1/4 turn after the spark
plugs seat to compress the washers.
The spark plugs must be securely
tightened. An improperly tightened
plug can become very hot and may
cause engine damage.
10. Push the wire connector onto the
ignition coil. Make sure it locks in
place.
11. Install the ignition coil. Reinstall
the bolt.
12. Repeat this procedure for the
other three spark plugs.
13. Reinstall the plug maintenance
cover and engine cover. When
reinstalling the covers, make sure
not to jam the wire harnesses in
between the covers and engine
case.
<Optional Parts: Iridium Spark
Plug>
Recommended spark plug:
IZFR6K-11E (NGK)
Use only the recommended spark
plugs or equivalent. Spark plugs
which have an improper heat range
may cause engine damage.
Installation and removal procedure of
the iridium spark plugs are the same
as the standard spark plugs.