Polaris Scrambler 9921620 - Manual (Page 61)

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EMISSION CONTROL SYSTEMS
Noise Emission Control System
Do not modify the engine, intake or exhaust components, as doing so
may affect compliance with governmental noise level requirements.
Exhaust Emission Control System
The emissions from the exhaust of this vehicle are controlled by engine
design, including factory-set fuel delivery and ignition. The engine
and related components must be maintained at Polaris specifications to
achieve optimal performance.
Engine idle speed is the only adjustment Polaris recommends that the
operator perform. Any other adjustments should be performed by an
authorized Polaris dealer.
Electromagnetic Interference
This spark ignition system complies with USA requirements, Canadian
ICES--002 and European directives 89/336/EEC and 97/24/EC.