Schematic Drawing; Function; Exhaust Emission Control System - KYMCO GRAND DINK 50 Service Manual

17
. EXHAUST EMISSION CONTROL
SYSTEM

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
Secondary Air
Cleaner
Air Injection Cut-
off Valve
Reed Valve
Purpose
Filter secondary air.
Prevent exhaust
muffler noise and
backfiring at sudden
deceleration.
Control the secondary
air inlet to reduce CO.
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.
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.
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.
GRAND DINK 50
Function
17-1