2009 Kawasaki JET SKI Ultra 260X Owners Manual - Page 133

2009 Kawasaki JET SKI Ultra 260X Manual

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MAINTENANCE AND ADJUSTMENTS 131 Spark Plug The standard spark plug is NGK PMR9B set to a 0.6 ∼ 0.7 mm (0.024 ∼ 0.028 in.) gap. Since the engine is water-cooled and is generally operated at a constant throttle opening, cylinder head temperature is relatively stable. For this reason, if the engine is in good condition and properly tuned, it should not be necessary to use a spark plug of a different heat range. Since a spark plug of the wrong heat range can cause extensive engine damage, only the standard spark plug is recommended. Spark Plug Inspection and Replacement the spark plugs and inspect the ceramic • Remove insulators. The appearance of the insulators reflects the efficiency of the combustion process. When the engine is operating properly, the plug insulators should be clean and show a light brown color. If the insulators look glazed or very white, if the electrodes appear overheated, or if there are gray metallic deposits on the plugs, combustion chamber temperatures are too high. Refer to the TROUBLESHOOTING GUIDE. j CAUTION As excessive operating temperature can cause serious engine damage, the cause should be located and corrected immediately. dry, sooty black deposit on the insulators indi•A cates an overly rich fuel/air mixture. Check for cor- • • rect throttle control cable adjustment. Refer to the TROUBLESHOOTING GUIDE. Inspect the condition of the spark plug. If the spark plug electrodes are rounded, damaged, or the insulator is cracked, replace the plug. Measure the spark plug gap. Use a wire-type thickness gauge to prevent possible damage to the platinum alloy electrode.

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MAINTENANCE AND ADJUSTMENTS
131
j
Spark Plug
The standard spark plug is NGK PMR9B set to a
0.6
∼
0.7 mm (0.024
∼
0.028 in.)
gap.
Since the
engine is water-cooled and is generally operated at a
constant throttle opening, cylinder head temperature
is relatively stable.
For this reason, if the engine
is in good condition and properly tuned, it should
not be necessary to use a spark plug of a different
heat range.
Since a spark plug of the wrong heat
range can cause extensive engine damage, only the
standard spark plug is recommended.
Spark Plug Inspection and Replacement
•
Remove the spark plugs and inspect the ceramic
insulators.
The appearance of the insulators re-
flects the efficiency of the combustion process.
When the engine is operating properly, the plug
insulators should be clean and show a light brown
color. If the insulators look glazed or very white, if
the electrodes appear overheated, or if there are
gray metallic deposits on the plugs, combustion
chamber temperatures are too high. Refer to the
TROUBLESHOOTING GUIDE.
CAUTION
As
excessive
operating
temperature
can
cause serious engine damage,
the cause
should be located and corrected immedi-
ately.
•
A dry, sooty black deposit on the insulators indi-
cates an overly rich fuel/air mixture. Check for cor-
rect throttle control cable adjustment. Refer to the
TROUBLESHOOTING GUIDE.
•
Inspect the condition of the spark plug. If the spark
plug electrodes are rounded, damaged, or the in-
sulator is cracked, replace the plug.
•
Measure the spark plug gap.
Use a wire-type
thickness gauge to prevent possible damage to
the platinum alloy electrode.