Spark-Plug Cleaning And Adjustment - Yamaha XL700Y WaveRunner Owner's/Operator's Manual

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SPARK-PLUG CLEANING AND
ADJUSTMENT
The spark-plug is an important engine
component and is easy to inspect. The
condition of the spark-plug can indicate
something about the condition of the
engine. For example, if the centre elec-
trode porcelain is very white, this could
indicate an intake air leak or carburetion
problem in that cylinder. Do not attempt
to diagnose any problems yourself.
Instead, take the water vehicle to a
Yamaha Water Vehicle dealer. You should
periodically remove and inspect the
spark-plug because heat and deposits will
cause the spark-plug to slowly break
down and erode. If electrode erosion
becomes excessive, or if carbon and other
deposits
replace the spark-plug with another of the
correct type.
Standard spark plug:
BR-8HS
Before installing the spark-plug, measure
the electrode gap with a wire thickness
gauge; adjust the gap to specification if
necessary.
KA006
Spark-plug gap
0.6~0.7 mm (0.024~0.028 in)
When fitting the plug, always clean the
gasket surface and use a new gasket.
Wipe off any dirt from the threads and
screw in the spark-plug to the correct
torque.
Spark-plug torque:
25 Nm (2.5 m•kg, 18 ft•lb)
4-13
are excessive, you
:
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should