Honda H3011H User Manual download pdf (Page 46)

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

fuel mixture may also foul the spark plugs and cause hard starting.

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 an authorized Honda riding mower dealer perform this carbu-

retor modification.

Even with carburetor modification, engine horsepower w :II decrease about

3.5% for each 1,000 feet increase in altitude. The effect of altitude on

horsepower will be greater than this if no carburetor modification is made.

Whe,n the carburetor is modified for good high altitude operation, the

air/fuel mixture will be too lean at low altitude. Performance will decrease,

the engine will overheat.

To avoid an excessively lean air/fuel mixture, reinstall the standard main

jet and readjust the pilot screw for operation at altitudes lower than 6,000

feet above sea level.

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Honda H3011H User Manual Page 46