Suzuki DF15 Manuel Du Propriétaire page 50

To maintain a strong spark, you should clean
and adjust the plug at the interval shown in the
maintenance schedule.
Remove carbon deposits from the spark plug
using a small wire brush or spark plug cleaner,
and adjust the gap as follows:
Spark plug gap
If the electrode or insulator is damaged, or if
either shows excessive wear, then the spark
plug should be replaced.
48
0.8 – 0.9 mm
(0.031 – 0.035 in.)
BREATHER AND FUEL LINE
Inspect the breather and fuel line for leaks,
cracks, swelling, or other damage. If the
breather and fuel line are damaged in any way,
they must be replaced. Consult your authorized
Suzuki Marine dealer if it is necessary to
replace them.
Breather line
Fuel line
Fuel line
 WARNING
Fuel leakage can contribute to an explo-
sion or fire, resulting in serious personal
injury.
Have your authorized Suzuki marine
dealer replace the fuel line if there is any
evidence of leaking, cracking or swelling.