Erratic throttle response on a 2009 Yamaha R6S, even after installing a new Throttle Position Sensor (TPS), could be caused by a few different factors. Here are a few potential causes to consider:
TPS calibration: After installing a new TPS, it's important to ensure that it is properly calibrated. The TPS needs to be set at the correct voltage and position to accurately communicate the throttle position to the engine control unit (ECU). If the TPS is not calibrated correctly, it can result in erratic throttle response. Double-check the TPS calibration procedure for your specific model and make sure it has been performed accurately.
Throttle cable adjustment: An improperly adjusted or stretched throttle cable can cause erratic throttle response. Make sure the throttle cable is properly adjusted to provide smooth and consistent operation. If the cable is excessively worn or damaged, it may need to be replaced.
Intake or fuel delivery issues: Erratic throttle response can also be caused by problems with the intake system or fuel delivery. Check for any air leaks in the intake system, such as loose hoses or gaskets, that could be introducing unmetered air into the engine. Additionally, ensure that the fuel injectors are clean and functioning properly. Clogged or faulty injectors can disrupt fuel delivery and cause inconsistent throttle response.
ECU or electrical issues: There's a possibility that there may be an issue with the ECU or other electrical components. Faulty wiring, loose connections, or sensor malfunctions can all contribute to erratic throttle response. A thorough inspection of the electrical system, including wiring harnesses and connectors, may be necessary to identify and address any potential issues.
It's worth noting that diagnosing and resolving throttle response issues can be complex, and it may be beneficial to consult a qualified motorcycle mechanic or Yamaha dealership. Their expertise and access to diagnostic tools can help identify the root cause of the problem and provide an appropriate solution.