Carburetor Modification For High Altitude Operation; Battery - Honda Marine BF25D Owner's Manual

TECHNICAL AND CONSUMER INFORMATION
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.
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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 high altitude operation,
the air-f uel mixture will be too lean
f or low altitude use. Operation at
altitudes below 3,000 f eet (900
meters) with a modif ied carburetor
may cause the engine to overheat
and result in serious engine damage.
For use at low altitudes, have an
authorized Honda Marine dealer
return the carburetor to original
f actory specif ications.

Battery

For complete information, refer to
the battery manufacturer's
instructions.
Minimum Requirements
12V-52Ah/5HR (65Ah/20HR)
(CCA 420)