Exhaust Emission Control System - KYMCO ZX Service Manual

17
. EVAPORATIVE/EXHAUST EMISSION

EXHAUST EMISSION CONTROL SYSTEM

The exhaust emission control system adopted by this model is an oxidizing catalytic converter which is
located in the middle of the exhaust muffler to reduce pollutants in the exhaust emission.
Exhaust Muffler Diagram
FUNCTION
Item
Oxidizing
Catalytic
Converter
TROUBLESHOOTING
Lack of power and high CO & HO
1. Clogged exhaust muffler
2. Faulty oxidizing catalytic converter
3. Carburetor adjusted improperly
4. Clogged air cleaner
5. Faulty spark plug
6. Incorrect ignition timing
17-1
CONTROL SYSTEM
Catalytic Converter
Purpose
Reduce the concentration of
HC and CO in the exhaust
emission.
Function
The precious metal in the oxidizing catalytic
converter is used to oxidize HC and CO in the
exhaust emission into CO
air pollution.
Engine runs erratic at idle speed and
high fuel consumption
1. Clogged exhaust muffler
2. Clogged carburetor
3. Clogged air cleaner
4. Faulty spark plug
5. Incorrect ignition timing
EXHAUST MUFFLER
REMOVAL
ZX / SCOUT
and H O to avoid
2 2