Honda BF250A Owner's Manual page 75

<Optional Parts : Iridium Spark
Plug>
RECOMMENDED SPARK PLUGS:
IZFR6K-11E (NGK)
Incorrect spark plugs can cause
engine damage.
Installation and removal procedure of
the Iridium spark plugs are the same
as the standard spark plugs.
These spark plugs have an iridium
coated center electrode.
Be sure to observe the following
when servicing iridium spark plugs.
• Do not clean the spark plugs. If an
electrode is contaminated with
accumulated objects or dirt, replace
the spark plug with a new one.
SERVICING YOUR OUTBOARD MOTOR
• Use only a ''wire-type feeler
gauge'' to check the spark plug gap
if necessary. To prevent damaging
the iridium coating of the center
electrode, never use a ''leaf-type
feeler gauge.''
The gap should be 0.039 – 0.051
inches (1.0 – 1.3 mm).
• Do not adjust the spark plug gap.
If the gap is out of specification,
replace the spark plug with a new
one.
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