Cruising In Shallows; High Altitude Operation - Honda BF5A Owner's Manual

Cruising in Shallows

When cruising in shallows, tilt up the
motor to prevent the propeller and
gear case from hitting bottom.
''
Refer to Tilting the motor (page
44 ) for the procedure.
Be sure that the water is coming
out of the cooling water check
hole.
When the outboard motor is
tilted up, cruise at low speed.

High Altitude Operation

At high altitude, the standard
carburetor air-fuel mixture will be
too rich. Performance will decrease,
''
and fuel consumption will increase.
A very rich mixture will also foul the
spark plug and cause hard starting.
High altitude performance can be
improved by specific modifications
to the carburetor. If you always
operate the outboard motor at
altitudes higher than 1,500 m (5,000
feet) above sea level, have your
authorized Honda dealer perform
these carburetor modifications.
Even with suitable carburetor jetting,
engine horsepower will decrease
approximately 3.5 % for each
300 m (1,000 feet) increase in
altitude. The effect of altitude on
horsepower will be greater than this
if no carburetor modification is made.
OPERATION
When the carburetor have been
modified for high altitude
operation, the air-fuel mixture will
be too lean for low altitude use.
Operation at altitudes below 1,500
m (5,000 feet) with modified
carburetor may cause the engine to
overheat and result in serious
engine damage. For use at low
altitudes, have an authorized
Honda outboard motor dealer
return the carburetor to original
factory specifications.
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