High Altitude Operation - Honda FF500 Manuel De L'utilisateur

• High altitude operation

At high altitude operation, 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 610 m
(2,000 feet) above sea level, have your servicing 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.
CAUTION:
Operation of the tiller 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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