2005 Yamaha Outboard 90D Boat Motor Owners Manual

Operation
ciency. This is generally when the keel line of   through the water, decreasing fuel economy
the boat is up about 3 to 5 degrees. With the    and making it hard to increase speed. Oper-
bow up, the boat may have a greater tenden-   ating with excessive trim-in at higher speeds
cy to steer to one side or the other. Compen-   also makes the boat unstable. Resistance at
sate for  this as you  steer. The trim  tab can    the bow is greatly increased, heightening the
also  be adjusted  to  help  offset this  effect.    danger  of bow steeringand making opera-
When the bow of the boat is down, it is easier  tion difficult and dangerous.
to  accelerate   from  a  standing  start   onto
plane.
NOTE:
Depending on the type of boat, the outboard
Bow Up
motor trim angle may have little effect on the
trim of the boat when operating.
Too much trim-out  puts the bow of the  boat
too high in the water. Performance and econ-
omy are  decreased because the  hull of the
boat is pushing the  water and there is more
air drag. Excessive  trim-out can also  cause
the propeller to ventilate, which reduces per-
formance  further,  and  the  boat may  por-
poise(hop in the water),  which could throw
the operator and passengers overboard.
EMU27931
Tilting up and down
If the engine will be stopped for some time or
if  the boat  is moored  in  shallows, the  out-
board motor should be tilted up to protect the
propeller and  casing from  damage by colli-
sion  with obstructions,  and  also to  reduce
salt corrosion.
EWM00220
WARNING
Be  sure all  people are  clear  of the  out-
board  motor when  tilting  up and  down,
also  be  careful  not  to  pinch  any  body
parts between  the drive  unit and engine
bracket.
EWM00250
WARNING
Leaking fuel is  a fire hazard. If  there is a
Too much trim-in  causes the boat  to plow”     fuel joint on the outboard motor, discon-
Bow Down
32
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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