If your Bajaj Pulsar NS200's RPM meter increases without you applying throttle while the bike is at a stop, it could be due to an issue with the idle control system or a vacuum leak. Here are a few possible reasons for this behavior:
Idle control system: Your motorcycle is equipped with an idle control system that maintains a consistent idle speed when the bike is stationary. If there is a malfunction in this system, it can cause the RPM to increase unexpectedly. The issue may be related to a faulty idle control valve or a problem with the electronic throttle body, if equipped. A thorough inspection of the idle control system by a qualified mechanic is recommended to diagnose and address the problem.
Vacuum leak: A vacuum leak can disrupt the air-fuel mixture and lead to irregular engine operation. If there is a leak in the intake manifold or any associated hoses, it can cause the engine RPM to increase on its own. Check for any loose or damaged hoses or gaskets that could be causing the vacuum leak. Repairing or replacing the affected components should resolve the issue.
Throttle cable or throttle body issue: A malfunctioning throttle cable or a sticking throttle body could also cause the RPM to increase without throttle input. Inspect the throttle cable for any damage or binding, and ensure it is properly adjusted. Additionally, a throttle body that is dirty or needs adjustment may contribute to this problem. Cleaning or adjusting the throttle body might be necessary.
It is important to have a qualified mechanic inspect and diagnose the specific cause of the RPM increase in your Bajaj Pulsar NS200. They will be able to perform a thorough examination of the idle control system, vacuum lines, throttle components, and other relevant parts to identify the underlying issue. Once the problem is identified, appropriate repairs or adjustments can be made to restore normal operation of your motorcycle.