Is There a Three-Way Catalytic Converter Inside a Motorcycle Exhaust Pipe?
1 Answers
Motorcycle models compliant with China's National III emission standards and later are equipped with three-way catalytic converters. The three-way catalytic converters on motorcycles are different from those on cars due to differences in engines, calibrations, and the composition ratios of exhaust gases, resulting in different catalysts. According to the regulations of the Ministry of Environmental Protection of the People's Republic of China, not every motorcycle currently has one. How to judge the condition of a three-way catalytic converter: Visual inspection. Check the exterior of the three-way catalytic converter for damage or stains. If there are scratches, cracks, etc., it is likely that the catalytic converter has been damaged. If there are noticeable gray spots in the center of the catalytic converter's protective cover, severe discoloration spots, or purple stains on the shell, it may indicate overheating issues. Observe engine exhaust conditions. Place your hand near the exhaust pipe outlet to feel the exhaust flow and check if the three-way catalytic converter is clogged or if there are exhaust flow issues. Another method is to open the air filter, remove the filter element, and observe if there is exhaust backflow during rapid acceleration, indicating poor exhaust flow. To assess the condition of the TWC (Three-Way Catalyst), check if the secondary air injection pump is faulty. Use an infrared thermometer. Compare the temperature difference before and after the TWC using an infrared thermometer. If the temperature difference between the inlet and outlet of the three-way catalytic converter is less than 10°C, the TWC is damaged.