Technical & Consumer Information; Technical Information; Serial Number Locations; Carburetor Modifications For High Altitude Operation - Honda HHE31C Owner's Manual

TECHNICAL INFORMATION

This section contains important information
about serial number locations, operation at high
altitudes, oxygenated fuels and emissions
control systems.

Serial Number Locations

FRAME SERIAL
NUMBER
ENGINE SERIAL
NUMBER
There are two serial numbers, one for the stick
edger and another for the engine. Record these
numbers in the space provided. You'll need to
have these numbers available when ordering
parts or making technical or warranty inquires
(page 38).
Frame Serial #:
Engine Serial #:
TECHNICAL & CONSUMER INFORMATION
Carburetor Modifications 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 stick edger at altitudes
above 5,000 feet (1,500 meters), have your
servicing dealer perform this carburetor
modification. This engine, when operated at
high altitude, with carburetor modifications for
high altitude use, will meet each emission
standard throughout it's 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
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.
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