Honda Outboard Motor BF2A Owner's Manual page 25

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High altitude operation
At high altitude, the standard carburetor air-fuel mixture will be excessive-
ly rich. Performance will decrease, and fuel consumption will increase.
High altitude performance can be improved by installing a smaller diameter
main fuel jet in the carburetor and readjusting the pilot screw. If you
always operate the outboard motor at altitudes higher than 6,000 feet
above sea level, have your authorized Honda Outboard Motor dealer per-
form these carburetor modifications.
Even with suitable caburetor jetting, engine horsepower will decrease ap-
proximately 3.5% for each 1,000 foot increase in altitude. The effect of
altitude on horsepower will be greater than this if no carburetor modifica-
tion is made.
CAUTION: 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.
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