HONDA BF20D - Manual (Page 108)

106
Carburetor Modification for
High Altitude Operation
TECHNICAL AND CONSUMER INFORMATION
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 5,000 f eet (1,500
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.
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.
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.
High altitude performance can be
improved by specific modifications
to the carburetor. If you always
operate your outboard motor at
altitudes above 5,000 feet (1,500
meters), have an authorized Honda
marine dealer perform this carburetor
modification.
07/09/19 18:32:50 31ZY0600_107