2004 Yamaha Outboard 40C 50C Boat Owners Manual

63B-9-1B-4
2/27/03 3:38 PM   Page 13
E
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
Product Specification
CategoriesYamaha Outboard Manuals
Document TypeBoat Motor Manual Free Download. Marine Operator's Boating Guide.
Tags,
Model Year2004
Download File
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- 114 pages
LanguageEnglish
Product BrandYamaha 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 TypePDF
Publisheryamaha-motor.com
Wikipedia's PageYamaha Motor Company
CopyrightAttribution Non-commercial
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