Suzuki DF25A 2014 Owner's Manual page 59

To maintain a strong spark, you should clean
and adjust the plugs at the intervals shown in
the maintenance chart. Remove carbon depos-
its from the spark plugs using a small wire
brush or spark plug cleaner, and adjust the gap
according to the following chart:
Spark plug gap
1. Excessive wear
4. Erosion 5. Yellow deposits
NOTE:
If the spark plug condition is found as shown in
the illustration above, ensure it is replaced with
new one. Otherwise, it will cause difficulty in
starting the engine, increase fuel consumption,
and result in engine troubles.
56
0.8 – 0.9 mm
(0.031 – 0.035 in.)
2. Breakage 3. Melting
6. Oxidation
BREATHER AND FUEL LINE
Inspect the breather and fuel line for leaks,
cracks, swelling, or other damage. If the
breather and fuel line is damaged in any way, it
must be replaced. Consult your authorized
Suzuki Marine Dealer if it is necessary to
replace them.
 WARNING
Fuel leakage can contribute to an explosion 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.