Shallow Water Operation; High Altitude Operation - Honda BF2D Owner's Manual

Shallow Water Operation

Excessive trim/tilt angle during
operation can cause the propeller
to raise out of the water and cause
propeller ventilation and engine
over-revving.
When operating in shallow water, tilt
the motor up to prevent the propeller
and gear case from hitting the bottom
(see page 37 ). With the motor tilted
up, operate the motor 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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