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Cleaning and adjusting spark plug
When removing or installing a spark plug, be careful not to damaged insul-
ator could allow external sparks, which could lead to explosion or fire.
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 center electrode porclain is very white, this could
indicate an intake air leak or carburetion problem in that cylinder. Do not atte-
mpt to diagnose any problems yourself. Instead, take the outboard motor to a
dealer. You should periodically remove and inspect the spark plug becausee
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.
Greasing
Grease A (water resistant grease)
Grease D (corrosion resistant grease; for propeller shaft)
tandard spark plug:
BPR7HS
Before fitting the spark plug, measure the electrode gap with a wire thickness
gauge; adjust the gap to specification if necessary.
1. Spark plug gap
2. Spark plug I.D.mark (NGK)
Spark plug gap:
0.6-0.7 mm(0.024-0.028 in)
When fitting the plug, alaways 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:
25.0 Nm(18.4 ft-ib)(2.55 kgf-m)
NOTE:
If a torque-wrench is not available when you are fitting a spark plug, a good
estimate of the correct torque is 1/4 to 1/2 a turn past fingertight. Have the
spark plug adjusted to the correct torque as soon as possible with a torquewrench.
Checking fuel system
Gasoline and its vapors are highly flammable and explosive. Keep away
from sparks, cigarettes, flames, or other sources of ignition.
Leaking fuel can result in fire or explosion.
Check for fuel leakage regularly.
If any fuel leakage is found, the fuel system must be repaired by a qualified
michanic. Improper repairs can make the outboard unsafe to operate.
Check the fuel lines for leaks, crack, or malfunction. If a problem is found, your
dealer or other qualified mechanic should repair it immediately.
Checkpoints
Fuel system parts leakage
Fuel line joint leakage
Fuel line cracks or other damage
Fuel connector leakage
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