Operator`s manual

4-14
E
EJU00552a
SPARK PLUG CLEANING AND
ADJUSTMENT
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak
or carburetion problem in that cylinder. Do
not attempt to diagnose any problems your-
self. Instead, take the 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 are excessive, you should
replace the spark plug with another of the
correct type.
Before reinstalling the spark-plug, measure
the electrode gap with a wire thickness
gauge; adjust the gap to specification if nec-
essary.
When fitting the spark plug, always clean
the gasket surface. Wipe off any dirt from
the threads and screw in the spark plug to
the correct torque.
Standard spark plug:
BR8ES-11
Spark plug gap a:
1.0 ~ 1.1 mm (0.039 ~ 0.043 in)
Spark plug torque:
25 Nm (2.5 m
•
kg, 18 ft
•
lb)