High Altitude Operation
At higher altitudes, 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 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.
Fig 22
Draining Fuel Tank and Carburetor
To help prevent varnish deposits in the fuel system, drain the fuel from the tank and carburetor before storing the unit
for long periods of time. This will help prevent starting problems in the future. If the unit is stored with fuel and the fuel
becomes stale or turns gummy or to varnish the warranty does not cover the resulting repair or service.
Draining the fuel tank
•
Turn the fuel valve to the OFF position.
•
Turn the engine OFF
•
Remove the fuel line that leads from the carburetor to the petcock by squeezing the ends of the hose clamps and sliding
the fuel line off.
CAUTION!
Fuel tank must be empty before replacing fuel filter. Run unit until tank is empty, if needed,
or inspect filter prior to fill-up.
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