The rev light in the KTM 390 Duke is a visual indicator that is set to turn on at a specific engine speed, which in this case is 7000 RPM (revolutions per minute). The purpose of the rev light is to alert the rider that they are approaching the engine's redline, which is the maximum recommended RPM at which the engine should be operated.
Although the rev light comes on at 7000 RPM, it doesn't mean that the engine cannot rev higher. In fact, the KTM 390 Duke has a higher rev limit of 13,000 RPM, which means the engine is designed to safely operate within that range.
The reason the rev light is set at 7000 RPM is to provide a warning to the rider that they are approaching the engine's redline, indicating that they should consider shifting to a higher gear. Operating the engine consistently at or near the redline for prolonged periods may lead to increased wear and tear, reduced engine lifespan, and potential mechanical failures.
By setting the rev light at 7000 RPM, KTM aims to strike a balance between providing a clear indicator to the rider while still allowing some room for higher revs when necessary. It's essential for riders to monitor the rev light and adjust their riding style accordingly to ensure optimal engine performance and longevity.