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What is the difference between China III and China IV motorcycles?

2 Answers

LeRebecca

07/28/25 8:34pm

China III and China IV motorcycles refer to emission standards, with the difference being that China IV emissions are lower than China III, making them more environmentally friendly. Below is relevant information about China III and China IV: 1. China III motorcycles: China III motorcycles are those produced in accordance with the "Limits and Measurement Methods for Emissions from Motorcycles (Running Mode, China III Stage)" (GB14622-2007) and "Limits and Measurement Methods for Emissions from Mopeds (Running Mode, China III Stage)" (GB18176-2007) approved and promulgated by the Ministry of Environmental Protection, collectively referred to as the China III standard. 2. China IV motorcycles: China IV motorcycles refer to those that comply with the national standard GB14622-2016 "Limits and Measurement Methods for Emissions from Motorcycles (China IV Stage)", abbreviated as the China IV emission standard. It stipulates that from July 1, 2019, all motorcycles sold and registered must meet the China IV emission standard.

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LaKai

08/12/25 1:20am

The biggest difference between China III and China IV motorcycles lies in the technical details, and I understand that the core of these two standards is the upgrade in emission control. China III uses a carburetor system with relatively simple emission control, only reducing some pollution. China IV fully introduces electronic fuel injection and catalytic converters, precisely controlling fuel injection to reduce carbon monoxide and hydrocarbon emissions. The standard value comparison is significant—for example, the carbon monoxide emission limit for China IV is 0.5g/km, while China III is as high as 1.0g/km, achieving a halving effect that improves air quality. From a riding perspective, China IV engines start more smoothly, especially with faster response in low temperatures, and average fuel consumption is reduced by 5-10%, making them more economical for long-term use. Structurally, China IV adds sensors and electronic control units, which may require more professional maintenance, but overall reliability and environmental performance are stronger. The technological upgrade makes the engine cleaner and quieter, driving industry progress.

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