High Altitude Operation - Honda GXI 20 Owner's Manual

3.1
Turn the fuel valve t o t h e
OFF
position.
FUEL VALVE
\
*High altitude operation
A t 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 engine at altitudes higher than 6,000 feet above sea
level, have your authorized Honda Engine dealer perform these carburetor
modifications.
Even with suitable carburetor jetting, engine horse.power 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.
Operation of the engine 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 aidfuel mixture.
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