2005 Yamaha Outboard 90D Boat Motor Owners Manual

Maintenance
EMU28951
Cleaning and adjusting spark plug
EWM00560
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.
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 yourself.
Instead,   take   the   outboard  motor   to   a
Yamaha dealer. You  should periodically re-
move  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 re-
place the spark plug with another of the cor-
rect type.
1.
2. Spark plug I.D. mark (NGK)
Spark plug gap
Spark plug gap:
0.9
1.0 mm (0.0350.039 in)
When fitting the plug, always  clean the gas-
ket 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-lb) (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 fin-
ger-tight. Have the spark plug adjusted to the
correct  torque as  soon  as  possible with  a
torque-wrench.
Standard spark plug:
B8HS-10
BR8HS-10
Before  fitting the  spark  plug,  measure the
EMU28962
electrode gap  with a  wire thickness gauge;    Checking fuel system
adjust the gap to specification if necessary.
EWM00060
WARNING
Gasoline and  its vapors are  highly flam-
mable  and  explosive.  Keep  away  from
sparks,
cigarettes,
flames,
or
other
44
Product Specification
CategoriesYamaha Outboard Manuals
Document TypeBoat Motor Manual Free Download. Marine Operator's Boating Guide.
Tags
Model Year2005
Download File
Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step.
- 77 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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