KEEWAY FACT 50 4T Maintenance Manual page 153

3〉Please comply with periodic maintenance requirements. The exhaust control system of this motorcycle is in
accordance with the national regulation. For replacement of any component, please use our original parts and have
our designated distributor or service center carry out such replacement.
4> For the exhaust control system, it is forbidden to make any adjustment or replacement at random (including use
of spark plug, adjustment of idle speed, ignition timing, carburetor adjustment, etc.)
18.3 Mechanical function of the exhaust control system
General
This system adopts two-stroke single-cylinder engine, carburetor and air conduction device to maintain qualified
exhaust gas. Meanwhile, active carbon canister is used for exhaust gas evaporated from fuel.
※ Air induction device
Induce air into the exhaust pipe to react incompletely combusted CO and HC into harmless gas.
Division
Exhaust
Catalytic device
system
18.4 Catalytic conversion system
18.4.1 Structure:
Device
Catalytic converter
Constitution
Canned oxidized catalyst installed in the
center of the exhaust pipe is able to oxidize
（触媒加放点：the place where catalyst is placed）
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Function
CO, HC and NO
X.