Suzuki DF2.5 Owner's Manual page 26

SPARK PLUG
Your outboard motor comes equipped with the
following "standard" spark plug for normal us-
age.
NGK CR6HSA
CAUTION
It is important that you use ONLY resistor
type spark plug. Non-resistor type will in-
terfere with the function of the electronic
ignition, causing misfiring, or cause prob-
lems with other electronic boat equipment
and accessories.
A normally operating spark plug is very light-
brown in colour. If the standard plug is not suit-
able for your operating, consult your authorized
Suzuki Marine Dealer.
CAUTION
• Whitening or blackening of a spark plug
insulator can be caused by incorrect en-
gine adjustments as well as use of an
incorrect spark plug. Consult your au-
thorized Suzuki Marine Dealer before us-
ing a spark plug of a different heat
range.
Use of an improper spark plug can lead to
severe engine damage.
• Do not experiment with other spark plug
brands unless you can determine that they
are equivalent to the specified brand or you
may experience engine damage which may
not be covered under warranty.
• To install a spark plug, turn it in as far as
possible with your fingers, then tighten it
with a wrench. Do not overtighten or cross
thread the spark plug or the threads of the
cylinder head will be damaged.
Standard
To maintain a strong spark, you should clean and
adjust the plug at the intervals shown in the main-
tenance chart. Remove carbon deposits from the
spark plug using a small wire brush or spark plug
cleaner, and adjust the gap according to the fol-
lowing chart:
1. Excessive wear
4. Erosion
Spark plug gap
5. Yellow deposits
CAUTION
If the spark plug condition is found as shown
in the illustration above, ensure it is replaced
with new one. Otherwise, it will cause diffi-
culty in starting the engine, increase fuel con-
sumption, and result in engine troubles.
0.6 – 0.7 mm
(0.024 – 0.028 in.)
2. Breakage 3. Melting
6. Oxidation
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