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15.3 Mechanical function of the exhaust control system
Outline
The countermeasure of exhaust gas is taking the two-stroke single-cylinder engine，carburetor mode as the
reference and adopts Air induction device to maintain fine exhaust level. In addition, the charcoal Canister
Purge is employed in vaporized exhaust.
※ Improvement of engine
Middle spark plug ,semicircular combustion chamber and improvement of compression ratio， ignition
time，such improvement in exhaust system alone has achieved high intake and exhaust efficiency which
enables increase of combustion efficiency.
※ Air induction device
Introduce the air into the vent-pipe so that the CO and HC incomplete combustion could be turned into
innocuous gas in the second reaction.
difference Device Constituting part Objective and function
Combustion
system
Combustion chamber
Hemispherical
combustion
chamber
Middle spark plug and hemispherical
combustion chamber for security of
combustion.
Exhaust
system
Catalyst device
Catalyst
converter
Canned oxygenation catalyst installed
in the center of the vent pipe enables
the oxygenation of CO, HC and NOX.
—Adjustable parameters and suggested set value
·Idle adjustment- engine speed 1400±100rpm/min CO concentration 0.5-1.2％
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