High Altitude Operation - Honda FR800 Owner's Manual

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HIGH ALTITUDE OPERATION
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 plug and cause hard starting.
High altitude performance can be improved by specific modifications
to the carburetor. If you always operate your engine at altitudes above
1,500 meters (5,000 feet), have your servicing dealer perform this car-
buretor modification.
Even with carburetor modification, engine horsepower will decrease
about 3.5% for each 300-meter (l,OOO-foot) increase in altitude. The ef-
fect of altitude on horsepower will be greater than this if no carburetor
modification is made.
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When the carburetor has been modified for high altitude operation,
the air-fuel mixture will be too lean for low altitude use. Operation at
altitudes below 1,500 meters (5,000 feet) with a modified carburetor
may cause the engine to overheat and result in serious engine dam-
age. For use at low altitudes, have your servicing dealer return the car-
buretor to original factory specifications.
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