Honda HRC7018 Owner's Manual page 43

MAINTENANCE & ADJUSTMENTS
Proper Maintenance is the Owner's Responsibility
Replacement Parts
The emission control systems on your new Honda engine were designed,
built, and certified to conform with EPA and California emission
regulations. We recommend only the use of new, genuine Honda parts or
their equivalent. The use of other replacement parts which are not of
equivalent quality may impair the effectiveness of your emission control
system.
Maintenance
Follow the Maintenance Schedule on page 41. Remember that this
schedule is based on the assumption that your machine will be used for its
designed purpose. Sustained high-load or high-temperature operation, or
use in unusually wet or dusty conditions, will require more frequent service.
Modification for 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 mower at altitudes above 1,800
meters (6,000 feet) have an authorized Honda commercial mower dealer
perform this carburetor modification.
Even with the modification, engine horsepower will decrease about 3.5%
for each 300 meter (1000 foot) increase in altitude. The effect 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 1,800 meters (6,000 feet) with a modified carburetor may cause the
engine to overheat and result in serious engine damage. For use at low
altitudes, have an authorized servicing dealer return the carburetor to
original factory specifications.
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