17. EVAPORATIVE/EXHAUST EMISSION CONTROL SYSTEM SUPER 9 50 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 Catalytic Converter FUNCTION Item Purpose Function Reduce the concentration of The precious metal in the oxidizing catalytic Oxidizing HC and CO in the exhaust converter is used to oxidize HC and CO in Catalytic emission. the exhaust emission into CO2 and H2O to Converter avoid air pollution. TROUBLESHOOTING Engine runs erratic at idle speed and Lack of power and high CO & HO high fuel consumption 1. Clogged exhaust muffler 1. Clogged exhaust muffler 2. Faulty oxidizing catalytic converter 2. Clogged carburetor 3. Carburetor adjusted improperly 3. Clogged air cleaner 4. Clogged air cleaner 4. Faulty spark plug 5. Faulty spark plug 5. Incorrect ignition timing 6. Incorrect ignition timing 17-1