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 of the electrode porcelain is very
white, this could indicate an intake air leak or carburation problem in that
cylinder. Do not attempt to diagnose any problems yourself. Instead, take
the Jet boat to your dealer. You should periodically remove and inspect the
spark plug because heat and deposits will cause the spark plug to slowly
breakdown and erode. If electrode erosion becomes excessive, you should
replace the spark plug with another of the correct type.
•
Before installing the spark plug, measure the electrode gap with a wire
thickness gauge; adjust the gap with a wire thickness gauge; adjust the gap
to specification if necessary.
•
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 new spark plug
to the correct torque.
•
Spark plug torque: 25Nm (2.5 kgm/18 ftlb).
NOTE :
Before installing the spark plug cap, be sure to wipe off any water on
the plug or inside the cap. Push the spark plug cap down until it
clicks.
NOTE :
If a torque -wrench is not available when you are fitting a spark plug,
a good estimate of the correct torque (with a new gasket) is ¼ to ½ a
turn past finger-tight. Have the spark plug adjusted to the correct
torque as soon as possible.
WARNING
When removing or installing a spark plug, be careful not to
damage the insulator. A damaged insulator could allow
external sparks, which could lead to explosion or fire.
1.
Spark plug type:
320 dl Jet: NGK BR-7HS
400 dl Jet: NGK BR-8HS
34
1
0.6 - 0.7 m m (0.024
- 0.028 in)
