23
High altitude operation
Once a carburetor is jetted for high altitude use, operation at lower
altitudes without rejetting may result in reduced performance,
overheating, and serious engine damage.
At high altitude, the standard carburetor air-fuel mixture will be
excessively rich. Performance will decrease, and fuel consumption will
increase.
High altitude performance can be improved by specific modifications
to the carburetor. If you always operate the tiller at altitude higher than
1,500 m (5,000 feet) above sea level, have your authorized Honda
dealer perform these carburetor modifications.
Even with suitable carburetor jetting, engine horsepower will decrease
approximately 3.5 % for each 300 m (1,000 foot) increase in altitude.
The effect of altitude on horsepower will be greater than this if no
carburetor modification is made.
It is espscially important to rejet a carburetor when going from a
higher altitude to a lower one. At lower altitudes, the air/fuel mixture
may become excessively lean.
Summary of Contents for FR750
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