Carburetor 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. Operation at an altitude that differs from that at which this
engine was certified, for extended periods of time, may increase emissions.
High altitude performance can be improved by specific modifications to the carburetor.
If you always operate your generator at altitudes above 5,000 feet (1,500
meters),
have your authorized
servicing dealer perform this carburetor
modification. This engine, when operated at high altitude with the carburetor
modifications for high altitude
use, will meet each emission standard throughout its
useful life.
Even with carburetor modification, engine horsepower will decrease about 3.5% for
each 1,000-foot (300-meter) increase in altitude. The effect of altitude on horsepower
will be greater than this if no carburetor modification is made.
NOTICE
TECHNICAL & CONSUMER INFORMATION
-38-
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 5,000 feet (1,500
meters) with a modified carburetor may cause the engine to overheat and result in
serious engine damage. For use at low altitudes, have your servicing dealer return the
carburetor to original factory specifications.
MCH
