High Altitude Operation - Honda WD20X Owner's Manual

Oil Alert System
The Oil Alert System is designed to prevent engine damage caused by an
insufficient amount of oil in the crankcase. Before the oil level in the
crankcase can fall below the safe limit, the Oil Alert System will
automatically shut down the engine (the engine switch will remain in the
ON position).
If the Oil Alert System shuts down the engine, the Oil Alert lamp will flash
when you operate the starter, and the engine will not start. If this occurs,
add engine oil (p. 7 1.
OIL ALERT LAMP
+Tiii
8w ON
OFF
High altitude operation
ENGINE SWITCH
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, cause hard starting and contribute to
air pollution.
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 1,800 meters (6,000 feet) above
sea level, have an authorized Honda water pump dealer perform this
carburetor modification.
Even with suitable carburetor jetting, engine horsepower will decrease
approximately 3.5% for each 300 meter (1,000 foot) increase in altitude.
The effect of altitude on horsepower will be greater than this if no
carburetor modification is made. A reduction in engine horsepower will
reduce pumping performance.
When the carburetor is 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 high altitude carburetor modifications,
may cause the engine to overheat and result in serious engine damage.
For low altitude use, reinstall the standard main fuel jet, and readjust the
pilot screw.
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