What is the purpose of the letter A on a motorcycle?

The letter A symbol accompanied by a curved arrow signifies the activation/deactivation of the Idling Stop feature on a scooter.

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For scooters, the Idling Stop is a technology equipped with the function of temporarily turning off the scooter engine when it is not in operation. For scooters equipped with this feature, when the scooter is not in operation for more than 3 seconds, this technology will be activated to temporarily turn off the engine.

The sign to recognize that Idling Stop has been activated is the letter A with an arc-shaped arrow surrounding it on the screen, which will light up until the scooter continues to operate.

This is a very useful technology for scooter users, especially for those who use scooters in crowded and congested street conditions.

When Idling Stop is turned on, the scooter’s engine will automatically turn off when the traffic light turns red. When the traffic light changes to green, just gently twist the throttle and the scooter will automatically start to continue the journey.

Fuel efficiency is the first thing mentioned about the benefits that Idling Stop brings to users.

Environmental protection is achieved by minimizing the amount of emissions as well as the noise from the engine when the Idling Stop mode is activated.

When the Idling Stop mode is activated, the scooter will enter a temporary idle state, and the engine will be smooth. When movement is required, there is no need to restart the scooter from the beginning.


The letter A symbol accompanied by an arc-shaped arrow indicates the on/off state of the Idling Stop feature on scooters. (Image: Okxe)

Usage note:

To turn on/off the Idling Stop function, you use the switch to turn on/off this function on the control panel on the right side.

The Idling Stop will be activated by the vehicle’s central processing unit (ECU) when the scooter starts up and runs for the first time, reaching a speed of over 10km/h and an engine temperature of over 50 degrees Celsius.

If we kick the side stand when the scooter is turned off by the Idling Stop or switch the button through the Idling, the function will be turned off. If you want to start the engine again, you will have to use the starter button. If the water cooling temperature is too hot (Fi light or temperature light is on), or if the scooter has an electronic fuel injection malfunction, the Idling Stop cannot be used.

Idling Stop is a technology equipped on cars and popular in new scooters. This technology is designed to reduce the amount of time the engine operates when the vehicle is idling or stopped at a red light. The goal of this technology is to reduce fuel consumption and greenhouse gas emissions by turning off the engine when not needed.

With the Idling Stop technology, when conditions permit (for example, when the scooter is stationary and there is no need to continue moving), the engine will automatically shut off and then restart when the rider twists the throttle or has any other movement request.

According to VTC news

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Frequently asked questions

The letter ‘A’, often surrounded by a triangle, is a certification mark of the Alliance of Automobile Manufacturers. It indicates that the vehicle meets certain standards for emissions, noise, and safety in the United States. This mark is usually found on the engine casing or the frame of the motorcycle.

The ‘A’ certification mark is important as it ensures that the motorcycle complies with the regulations set by the Environmental Protection Agency (EPA). It guarantees that the vehicle has passed rigorous tests and meets the required standards for emissions and noise pollution control. Additionally, it ensures that the motorcycle adheres to safety standards, providing peace of mind to riders and helping to maintain a certain level of quality across the industry.

Yes, in addition to the ‘A’ mark, you may also come across the ‘B’ certification mark, which indicates that the motorcycle meets the standards set by the California Air Resources Board (CARB). This mark is specifically for vehicles sold in California, which has stricter emissions standards than the federal government. So, if you’re in California, keep an eye out for both the ‘A’ and ‘B’ marks to ensure your motorcycle is compliant with state regulations.

The triangle surrounding the ‘A’ letter is a unique symbol that further emphasizes the vehicle’s compliance with the established standards. It serves as a quick visual identifier, making it easier for authorities and consumers alike to recognize that the motorcycle has been certified by the Alliance of Automobile Manufacturers and meets the necessary requirements.

While there may not be direct penalties specifically for riding a motorcycle without the ‘A’ mark, it is important to remember that it indicates a lack of compliance with emissions and safety standards. This could result in fines or other legal consequences if your motorcycle is found to be in violation of local or state regulations. It is always best to ensure that your vehicle meets all the necessary standards to avoid any potential issues.