Technical And Consumer Information - Honda BF8D Owner's Manual

Carburetor Modification for
High Altitude Operation
At altitudes above 3,000 feet (900
meters), 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.
Operation at an altitude that differs
from that at which this engine was
certified, for extended periods of
time, may increase emissions.
High altitude operation can be
improved by specific modifications
to the carburetor. If you usually
operate your outboard motor at 3,000
feet (900 meters) or above, consult
with your authorized Honda Marine
dealer.
Your dealer can determine the
appropriate carburetor settings for the
altitude at which you operate your
outboard motor.

TECHNICAL AND CONSUMER INFORMATION

Even with carburetor modification,
engine horsepower will decrease
about 3.5% for each 1,000-foot (300-
meter) increase in altitude. The effect
of altitude on horsepower will be
greater than this if no carburetor
modification is made.
When the carburetor has been
modif ied f or operation at one of the
higher altitude ranges, the air-f uel
mixture will be too lean f or
operation at a lower altitude.
Operation at altitudes below the
range f or which the carburetor is set
may cause the engine to overheat
and result in serious engine damage.
For use at lower altitudes, have an
authorized Honda Marine dealer
modif y the carburetor f or the
correct altitude range.
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