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TECHNICAL & CONSUMER INFORMATION
TECHNICAL INFORMATION
Serial Numbers
Record the engine and frame serial numbers (locations are shown on
page 8) in the spaces below. You may need these serial numbers
when ordering parts, and when making technical or warranty inquiries
(page 68).
Engine serial number:______________________________________
Frame serial number: ______________________________________
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.
High altitude performance can be improved by specific modifications to
the carburetor. If you always operate your lawnmower at altitudes
above 5,000 feet (1,500 meters), have your servicing dealer perform
this carburetor modification.
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.
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.
54
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