Honda GXV340 Owner's Manual page 15

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High altitude operation
At high altitude, the standard air-fuel mixture will be excessively rich. Per-
formance will decrease, and fuel consumption will increase.
High altitude performance can be improved by adjusting the fuel mixture.
If you always operate the engine at an altitude higher than 6000 feet
above sea level, have an authorized Honda engine dealer adjust the fuel
mixture for optimum performance at that altitude.
Even with suitable adjustment, engine horsepower will decrease approx-
imately 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.
CAUTION: Operation of the engine at an altitude lower than the air-fuel
mixture is adjusted for may result in reduced performance, overheating,
and serious engine damage caused by an excessively lean air/fuel mixture.
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