Differences Between China 3 and China 4 Motorcycle Standards
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The main differences lie in sulfur content and pollutant emission reductions. Below is an introduction to the distinctions between China 3 and China 4 standards: 1. The most significant difference between China 4 and China 3 motorcycles is the substantial improvement in emission standards, which leads to changes in motorcycle pricing and performance. To meet the emission requirements, China 4 motorcycles have replaced traditional carburetors with electronic fuel injection systems and upgraded their exhaust systems. 2. The China 4 motorcycle emission standard was implemented on July 1, 2019. This standard represents the fourth phase of national motor vehicle pollutant emission regulations, targeting pollutants such as HC (hydrocarbons), NOx (nitrogen oxides), CO (carbon monoxide), and PM (particulate matter). Through catalytic converters, emissions are controlled and reduced to levels below specified limits. 3. The China 4 standard primarily focuses on controlling harmful gas content in exhaust emissions. Therefore, all China 4 motorcycles utilize electronic fuel injection technology to reduce pollutant emissions.
The main difference between China III and China IV motorcycles lies in emission control technology. China IV models must be equipped with electronic fuel injection (EFI) systems instead of carburetors, enabling precise fuel delivery and higher engine combustion efficiency. Their pollutant emission limits are significantly stricter than China III - for example, the CO limit drops from 2.0g/km to 1.0g/km, while HC and NOx emissions must be reduced by over half. New vehicles also require onboard diagnostics (OBD) systems to monitor exhaust in real-time and trigger maintenance alerts when exceeding standards. Fuel tank sealing requirements are enhanced to prevent gasoline vapor leakage. China IV motorcycles typically operate more quietly with reduced vibration, though they cost several hundred to over a thousand yuan more.