21
The U.S. and California Clean Air Acts
EPA and California regulations require all manufacturers to furnish written instructions
describing the operation and maintenance of emission control systems.
The following instructions and procedures must be followed in order to keep the emissions from
your engine within the emission standards.
Tampering and Altering
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.
Problems That May Affect Emissions
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.
•
Misfiring or backfiring under load.
•
Afterburning (backfiring).
•
Black exhaust smoke or high fuel consumption.
Replacement Parts
The emission control systems on your engine were designed, built, and certified to conform to
EPA and California emission regulations. 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 can be confident of their performance. The use of
replacement 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 rebuild of the part must certify that use of the
part will not result in a failure of the engine to comply with emission regulations.
Maintenance
Follow the maintenance schedule on page 22. 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.
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