Shallow Water Operation; High Altitude Operation - Honda BF2.3D User 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.
When operating in shallow water, tilt
the outboard motor up to prevent the
propeller and gear case from hitting
the bottom (see page 38). With the
outboard motor tilted up, operate the
outboard motor at low speed.
40

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.
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.