Honda BF90D - Page 125

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124
MAINTENANCE
The spark plugs must be securely
tightened. An improperly tightened
plug can become very hot and may
cause engine damage.
SEALING WASHER
INSULATOR
BOX WRENCH
PLUG WRENCH
1.0 1.3 mm
(0.039 0.051 in)
If installing new spark plugs, tighten
1/2 turn after the spark plugs seat to
compress the washers.
If reinstalling used spark plugs,
tighten 1/8 1/4 turn after the spark
plugs seat to compress the washers.
Push the wire connector onto the
ignition coil. Make sure it locks in
place.
Install the ignition coil. Reinstall
the bolt.
Repeat this proce dure for the other
three spark plugs.
Reinstall the covers. When
reinstalling the covers, make sure
not to jam the wire harnesses in
between the covers and engine
case.
Measure the plug gaps with a wire-
type feeler gauge.
Remove the spark plug using the
plug wrench, box wrench and the
Phillips /flat-tip screwdrivers
(accessories).
Check the electrodes for wear, the
insulator for cracks and the sealing
washer for damage. Replace the
spark plug if necessary. Thread the plugs in by the plug
wrench to prevent cross threading.
After the spark plugs are seated,
tighten with a spark plug wrench
and box wrench to compress the
washers.
The gaps should be 1.0 1.3 mm
(0.039 0.051 in). If the gap is out
of the specification, replace the
plug with a new one. Never try to
readjust the gap.
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