65Carburetor Modification forHigh Altitude Operation
TECHNICAL AND CONSUMER INFORMATION
When the carburetor has been
modified for operationat one of the
higher altitude ranges, the air-fuel
mixture willbe too lean f or
operation at a loweraltitude.
Operation at altitudes below the
range for which the carburetor is set
may causethe engine to overheat
and result in serious engined amage.
For use at lower altitudes, have an
authorized Honda Marine dealer
modify thecarburetor for the
correctaltitude range.
At altitudes above 2,000 ft (600
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 causehard starting.
Your dealer can determine the
appropriatecarburetor settings for the
altitude at which you operate your
outboardmotor.
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
improvedby specif ic modifications
to thecarburetor. If you usually
operateyour outboard motor at 2,000
ft (600 meters) or above, consultwith
your authorizedHonda Marine dealer.
Even with carburetormodification,
enginehorsepower 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.
Settings:
Standard setting is for sea level to
2,000 ft (600 meters).
Mid-altitude setting is for 2,000 ft
(600 meters)to 5,000 f t (1,500
meters).
High-altitude setting is for 5,000 ft
(1,500 meters)and above.
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