TECHNICAL & CONSUMER INFORMATION
CARBURETOR MODIFICATION FOR HIGH ALTITUDE OPERATION
SOURCE OF EMISSIONS
PROBLEMS THAT MAY AFFECT EMISSIONS
REPLACEMENT PARTS
TAMPERING AND ALTERING
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
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may increase emissions.
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at altitudes above 5,000 feet (1,500 meters), have your servicing
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high altitude use, will meet each emission standard throughout its
useful life.
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altitude. The effect of altitude on horsepower will be greater than
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The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides
of nitrogen is very important because, under certain conditions,
they react to form photochemical smog when subjected to
sunlight. Carbon monoxide does not react in the same way, but it
is toxic.
This utilizes lean carburetor settings and other systems to
reduce the emissions of carbon monoxide, oxides of nitrogen and
hydrocarbons.
If you are aware of any of the following symptoms, have your
engine inspected and repaired by your servicing dealer.
Hard starting or stalling after starting.
Rough idle
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Black exhaust smoke or high fuel consumption.
We recommend the use of genuine parts whenever you have
maintenance done. These original-design replacement parts are
manufactured to the same standards as the original parts, so you
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parts that are not of the original design and quality may impair the
effectiveness of your emission control system.
A manufacturer of an aftermarket part assumes the responsibility
that the part will not adversely affect emission performance. The
manufacturer or rebuilder of the part must certify that use of
the part will not result in a failure of the engine to comply with
emission regulations.
Tampering with or altering the emission control system may
increase emissions beyond the legal limit. Among those acts that
constitute tampering are:
Removal or alteration of any part of the intake, fuel or exhaust
systems.
Altering or defeating the governor linkage or speed-adjusting
mechanism to cause the engine to operate outside its design
parameters.
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 (1,500meters) 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
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MAINTENANCE
Follow the maintenance schedule. Remember that this schedule
is based on the assumption that your machine will be used for
its designed purpose. Sustained high-load or high-temperature
operation, or use in unusually wet or dusty conditions, will require
more frequent service.
ENGINE TUNE-UP
ITEM SPECIFICATION
Spark plug gap
0.028-0.031 in
(0.70 mm -0.80 mm)
Valve clearance
IN: 0.10 mm ~ 0.15 mm (cold)
EX: 0.15 mm ~ 0.20 mm (cold)
2WKHUVSHFLĆFDWLRQV No other adjustments needed
PUBLICATIONS
PARTS CATALOG
These publications will give you additional information for
maintaining and repairing your engine. You may order them from
your engine dealer.
This manual provides complete, illustrated parts lists.
17
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