Carburetor Adjustment; High Altitude Operation - Honda Harmony HRB215SXA Owner's Manual

MAINTENANCE
Carburetor Adjustment
1.
Start the engine outdoors, and
allow it to warm up to normal
operating temperature.
2. Set the throttle lever in the
SLOW position.
3. Turn the throttle stop screw to
obtain the standard idle speed.
Standard idle speed:
2,100 f 150 rpm
THROTTLE STOP SCREW
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 6,000 feet (1,800 meters) have an authorized Honda lawn
mower dealer perform this carburetor modification.
In any case, engine horsepower will decrease about 3.5% for each 1000
foot (300 meter) increase in altitude. The effect of altitude on horsepower
will be greater than this if no carburetor modification is made.
1 NOTICE 1
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 6,000 feet (1,800 meters) with a modified carburetor
may cause the engine to overheat and result in serious engine
damage. For use at low altitudes, have an authorized Honda lawn
mower dealer return the carburetor to original factory specifications.
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