Shallow Water Operation; High Altitude Operation - Honda BF75A Owner's Manual

OPERATION

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. Excessive trim/tilt
angle can also damage the water
pump and overheat the engine.
When operating in shallow water, tilt
the motor up to prevent the propeller
and gear case from hitting the bottom
(refer to pages 86 and 91
motor tilted up, operate the motor at
low speed.
Monitor the cooling system indicator
for water discharge. Be sure that the
motor is not tilted so high that the
water intakes are out of the water.
If an excessive amount of throttle is
used when operating in forward gear,
the motor will return to the transom
angle adjusting rod. (G type)
98

High Altitude Operation

At high altitude, the standard
carburetor air/fuel mixture will be
excessively rich. Performance will
decrease, and fuel consumption will
increase.
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
). With the these carburetor modifications.
Even with suitable carburetor jetting,
engine horsepower will decrease
approximately 3.5 % for each 300 m
(1,000 foot) increase in altitude. The
effect of altitude on the horsepower
will be greater than this if no
carburetor modification is made.
Operation of the outboard
motor at an altitude lower than
the carburetor is jetted for may
result in reduced performance,
overheating, and serious
engine damage caused by an
excessively lean air/fuel
mixture.