kymco mo d200 Instruction De Maintenance

20

. EXHAUST EMISSION CONTROL

SYSTEM

20-1

SCHEMATIC DRAWING

EXHAUST EMISSION CONTROL SYSTEM

The exhaust emission control system adopted in this model utilizes the reed valve to draw

secondary air into the exhaust system for re-combustion by means of exhaust pulsation so as to

minimize the exhaust emission.

FUNCTION

Item

Purpose

Function

Secondary Air

Cleaner

Filter secondary air.

It filters the fresh air drawn for re-burning to

prevent dirt or dust from affecting the operation of

the air injection cut-off valve.

Air Injection Cut-

off Valve

Prevent exhaust

muffler noise and

backfiring at sudden

deceleration.

The air injection cut-off valve usually opens to lead

air into the exhaust muffler in which air is re-

burned to reduce CO.  When the throttle valve

closes suddenly, the air injection cut-off valve is

actuated by vacuum to close and cut off secondary

air in order to prevent exhaust muffler backfiring

due to air in the exhaust system.

Reed Valve

Control the secondary

air inlet to reduce CO.

When the motorcycle speed is less than 50km per

hour, the reed valve operates to draw secondary air

into the exhaust system for re-combustion.

Secondary

Air Cleaner

Carburetor

Reed Valve

Air  Injection

Cut-off Valve

Vacuum

Secondary Air

Cleaner  Into

Hole