Is There a Three-Way Catalytic Converter Inside a Motorcycle Exhaust Pipe?

1 Answers
OGabriel
07/29/25 10:44pm
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.
Was this review help?
6
5
Share
More Forum Discussions

What does the small wrench symbol mean in a Volkswagen?

Volkswagen vehicles displaying a small wrench symbol indicate a maintenance reminder. Below is relevant information about Volkswagen: 1. Production technology: Double-sided galvanized steel sheets and advanced cavity wax injection technology, combined with sophisticated car painting processes and automated spraying equipment, ensure years of corrosion protection for the vehicle body. Precision water honing technology, automated production lines, and cold testing technology of assembly lines guarantee excellent engine performance. 2. Configuration: The transmission is a 7-speed dual-clutch, and the body type is a 4-door, 5-seater sedan. The vehicle dimensions are 4670mm in length, 1806mm in width, and 1474mm in height, with a wheelbase of 2688mm.
13
3
Share

Reasons Why the Airbag Light Stays On

The reasons why the airbag light stays on are: Loose wiring or poor plug connection: One of the plugs in the airbag system may be disconnected or poorly connected. Check the connection status of all plugs (yellow plugs) and reconnect them. It is best to wrap a layer of black tape around the plug to ensure better fixation. Additionally, the negative terminal of the battery may be loose; simply tighten the screw. Sensor malfunction: The airbag connector, seat belt sensor, or airbag sensor may be faulty, requiring the replacement of related components. The driver-side side airbag sensor or the passenger-side side airbag sensor may also malfunction. ECU (computer board) malfunction: This requires replacing the airbag control unit, especially if the car has been involved in a collision before. After a collision where the airbag has deployed, fault codes are generally difficult to retrieve. This design ensures that after the airbag is triggered, a new airbag ECU must be replaced.
6
5
Share

What happens if the initial registration date on the insurance policy is different from the one on the vehicle license?

Here is the relevant introduction about the inconsistency between the registration date on the insurance policy and the vehicle license: 1. Impact on commercial insurance premiums: The initial registration date on the insurance policy is recorded based on the initial registration date on the vehicle license. An incorrect initial registration date may affect the commercial insurance premiums of the vehicle. Of course, if the error is not significant and falls within the same month, it will not have an impact. If the time difference is large, you can bring your ID card and the original vehicle license to the insurance company to apply for a correction. 2. The insurance company may deliberately evade responsibility: The inconsistency between the initial registration date on the insurance policy and the vehicle license does not have a significant impact, as the insurance company mainly verifies the license plate number, chassis number, and engine number. However, to prevent the insurance company from deliberately evading responsibility, it is best to go to the insurance company where you purchased the policy to correct the wrong information.
4
2
Share

What is the boiling point of Shell antifreeze?

The boiling point of Shell antifreeze is 106.5 degrees Celsius (at normal pressure). The key parameters for antifreeze are boiling point and freezing point - the lower the freezing point the better (e.g. -35°C is better than -30°C), while the higher the boiling point the better. The full name of antifreeze should be antifreeze coolant, meaning coolant with antifreeze function. Antifreeze prevents the coolant from freezing and cracking the radiator or damaging the engine cylinder block/head when parked in cold winter. Antifreeze is a special additive-containing coolant mainly used in liquid-cooled engine cooling systems. It has excellent properties including winter antifreeze protection, summer boil-over protection, year-round scale prevention, and corrosion resistance. Vehicle antifreeze generally needs replacement every 2 years or 40,000 kilometers - this is just a reference interval. For commercial vehicles with longer mileage, the replacement cycle should be shorter. Since each vehicle's operating conditions differ, replacement should be based on actual usage. Regularly check the antifreeze condition: replenish immediately if insufficient; if suspended matter, sediment, or deterioration/discoloration is observed, replace promptly and clean the system.
19
2
Share

What is the wading depth of an unmodified Wrangler?

The maximum wading depth of an unmodified Wrangler is 125mm. The wading depth of a Wrangler is determined by the height of the vehicle's chassis, which is the ground clearance listed in the vehicle's parameter configuration table. Generally, the greater the ground clearance, the higher the chassis, and the higher the safety factor when passing through waterlogged roads. Therefore, in terms of safe wading depth, off-road vehicles and SUVs have obvious advantages. However, for most compact and small cars with low chassis, the position of the vehicle's air intake should be used as a benchmark when passing through waterlogged roads. If the air intake is below the water level when the Wrangler is wading, water will be sucked into the engine's cylinders. Since water cannot be compressed like air, it will cause severe damage to the engine's mechanical components (such as connecting rods, pistons, crankshafts, etc.). Therefore, the wading depth must not exceed the height of the engine's air intake. The height of the engine's air intake, and thus the maximum wading depth, can also be increased by installing a snorkel. If wading is unavoidable, the following safe and correct operations should be performed: Before the vehicle enters the water, always turn off the auto start-stop function to prevent the engine from automatically restarting after stalling in the water, which could cause severe damage if water enters the engine. Judge the underwater road conditions based on the passage of vehicles ahead and choose an appropriate entry point. Observe the path taken by other vehicles and follow their tracks at low speed, avoiding sudden acceleration or deceleration. On roads prone to water accumulation, observe warning water level markers, trees, and other reference points such as the wheels and doors of other vehicles to estimate the water depth before deciding whether to proceed. Know your vehicle's safe wading depth. If the water depth exceeds half the height of the tires or the engine's air intake, do not enter the water recklessly; choose an alternative route instead.
15
4
Share

Can a Self-Assembled Motorcycle Be Licensed?

Self-assembled motorcycles cannot be licensed. To be eligible for licensing, the motorcycle must have a certificate of conformity and a computer-printed special motor vehicle license plate. Additionally, there is no production entry in the official database, so under normal conditions, it cannot be licensed and thus cannot be legally driven on the road. If discovered by traffic police, the vehicle may be impounded, and the owner may face fines. Licensing requires an invoice and a certificate of conformity. The certificate of conformity is nationally networked, with one certificate per vehicle, similar to an ID card, containing all the vehicle's information. Only motorcycles produced by manufacturers with official motorcycle production qualifications will have a certificate of conformity. Motorcycle Licensing Process: Take the purchase invoice to the tax bureau to pay the vehicle purchase tax. Only after successful tax payment can the subsequent procedures proceed. Purchase compulsory motorcycle insurance from a legitimate insurance company. Visit a motor vehicle inspection station for an inspection. Bring all the required documents to the local vehicle management office. At the office, take a number and fill out a registration form. Submit your ID card, tax certificate, insurance policy, vehicle conformity certificate, invoice, and other documents to the traffic police for verification. The chassis number and engine number will be imprinted, and the vehicle will be photographed for inspection. Afterward, wait to select a license plate number, pay the administrative fee, receive a temporary license plate, and the official license plate will be mailed to your home.
17
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.