There can be several reasons why your Yamaha R6 2008 is stalling when coming to a stop. It's difficult to diagnose the exact cause without more information, but here are a few common issues that could be contributing to the problem:
Idle speed: Check if the idle speed is set too low. If the idle speed is not sufficient, the engine may stall when coming to a stop. You may need to adjust the idle speed according to the manufacturer's specifications.
Fuel delivery: Insufficient fuel delivery or a clogged fuel system can cause stalling. Ensure that the fuel tank is clean, and the fuel filter is not clogged. Also, check if the fuel pump is functioning properly.
Air intake and throttle: A dirty or clogged air filter can restrict airflow, affecting engine performance. Similarly, a sticky or improperly adjusted throttle may cause stalling. Check the air filter condition and clean or replace it if necessary. Inspect the throttle operation and ensure it is smooth and responsive.
Electrical issues: Faulty spark plugs, ignition coils, or other electrical components can lead to engine stalling. Check the spark plugs for fouling or wear and replace them if needed. Inspect the ignition system for any visible damage or loose connections.
Engine sensors: Malfunctioning engine sensors, such as the idle air control valve or the throttle position sensor, can cause stalling. These sensors provide feedback to the engine control unit (ECU), which regulates fuel and air mixture. If any of these sensors are faulty, it can disrupt the engine's idle control. A diagnostic scan may be necessary to identify sensor-related issues.
It's recommended to have a professional mechanic diagnose and fix the stalling issue if you're not confident in your own mechanical skills. They have the experience and expertise to identify and resolve the problem effectively. However, if you're knowledgeable about motorcycle maintenance and have the necessary tools, you can attempt basic troubleshooting steps like checking the idle speed, air filter, and spark plugs. Always refer to the service manual for your specific motorcycle model to ensure you're following the correct procedures.