2007 Yamaha Outboard F75 F90 Boat Owners Manual

Operation
To lower  the bow (trim-in),  press the  switch
(down).
Make test runs with the trim set to different an-
gles to  find the  position  that works  best for
your boat and operating conditions.
EMU27911
Adjusting boat trim
When the boat is on plane, a bow-up attitude
results in less drag,  greater stability and effi-
ciency. This is generally when the keel line of
the boat is up about 3 to 5 degrees. With the
bow up, the boat may have a greater tenden-
cy to steer to one side or the other. Compen-
sate for  this as  you steer.  The trim tab  can
also  be  adjusted  to help  offset  this  effect.
When the bow of the boat is down, it is easier
to accelerate from a standing start onto plane.
Bow Down
Too much  trim-in causes  the boat  to plow
through the water,  decreasing fuel economy
and making it hard to increase speed. Operat-
ing  with excessive  trim-in at  higher  speeds
also makes the boat unstable.  Resistance at
the bow is greatly increased, heightening the
danger of bow  steeringand making opera-
tion difficult and dangerous.
Bow Up
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
NOTE:
boat is pushing the water and there is more air  Depending on the type of boat,  the outboard
drag. Excessive  trim-out can also cause  the    motor trim angle may have  little effect on the
propeller to  ventilate, which  reduces  perfor-    trim of the boat when operating.
mance further,  and the boat  may porpoise
(hop in the water), which could throw the op-
erator and passengers overboard.
EMU27933
Tilting up and down
If the engine will be stopped for some time or
if the boat is moored in shallows, the outboard
motor should be tilted up to protect the propel-
ler and casing from damage by  collision with
obstructions, and  also  to reduce  salt corro-
sion.
43
Product Specification
CategoriesYamaha Outboard Manuals
Document TypeBoat Motor Manual Free Download. Marine Operator's Boating Guide.
Tags,
Model Year2007
Download File
Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step.
- 90 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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