Table of Contents
Advertisement
TECHNICAL
AND CONSUMER
INFORMATION
Carburetor
Modification
for
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 plugs and
cause hard starting.
High altitude performance can be
improved by specific modifications to the
carburetors. If you always operate your
outboard motor at altitudes above 5,000
feet (I ,500 meters), have an authorized
Honda marine dealer perform this
carburetor modification.
Even with carburetor modification,
engine horsepower will decrease about
3.5% for each I ,OOO-foot (300-meter)
increase in altitude. The effect of altitude
on horsepower will be greater than this if
no carburetor modification is made.
I
I
When the carburetors have been mod$ed
for high altitude operation, the air-fuel
mixture will be too lean for low altitude
use. Operation at altitudes below 5,000
feet (1,500 meters) with modified
carburetors 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 carburetors to original factory
specifications.
87
Advertisement
Table of Contents
