Suzuki DF350A Owner's Manual page 87

5. Loosen and remove the spark plug using the
box wrench 2 and driver 3 in the tool bag.
Your outboard motor comes equipped with the
following "standard" spark plug for normal
usage.
Standard spark plug
NOTICE
Non-resistor types of spark plugs will
interfere with the function of the elec-
tronic ignition, causing misfiring, or
causing problems with other electronic
boat equipment and accessories.
Use ONLY resistor type spark plugs in
your outboard motor.
NGK ILZKR7D8
Inspect the spark plug for electrode wear, car-
bon deposits or insulator damage. If the elec-
trode has excessive wear, carbon deposits or
insulator damage, then the spark plug should
be replaced.
Center
electrode
Measure the plug gap using a wire type spark
plug gauge. If the plug gap value is out of the
service limit, replace the spark plug with a new
one.
NOTICE
If a spark plug gauge other than the wire
type is used, the electrode might be dam-
aged.
Make sure to use a wire type spark plug
gauge.
Spark plug gap
Standard
Service limit
Gap
Insulator
0.7 – 0.8 mm
(0.028 – 0.031 in.)
1.0 mm (0.039 in.)
85