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EMU01202
CLEANING AND ADJUSTING SPARK
PLUG
w
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.
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 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 outboard motor to a
Yamaha 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.
Standard spark plug:
Refer to “SPECIFICATIONS”, page 4-1.
Before fitting the spark plug, measure the
electrode
gap with a wire thickness
gauge; adjust the gap to specification if
necessary.
Spark plug gap:
Refer to “SPECIFICATIONS”, page 4-1.
4-12
| Categories | Yamaha Outboard Manuals |
|---|---|
| Document Type | Boat Motor Manual Free Download. Marine Operator's Boating Guide. |
| Tags | Yamaha 40C, Yamaha 50C |
| Model Year | 2004 |
| Download File |
|
| Language | English |
| Product Brand | Yamaha Motor. Yamaha Motor Corporation, USA - Support Customer Relations for US: 1-800-962-7926
Yamaha Boats: 1-800-962-7926 Yamaha Outboard Customer Relations: 1-866-894-1626 , Yamaha Outboard |
| Document File Type | |
| Publisher | yamaha-motor.com |
| Wikipedia's Page | Yamaha Motor Company |
| Copyright | Attribution Non-commercial |
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