What is an acceptable idle speed for the engine, measured in RPM?

An acceptable idle speed for the engine of a 45-Foot Response Boat-Medium (RB-M 45) is typically around 650 RPM. This idle speed is crucial for maintaining a smooth and stable operation of the engine while the boat is at rest. When the engine is at idle, it should be able to sufficiently circulate fluids, maintain electrical systems, and keep control systems responsive without creating excessive wear or fuel consumption.

Operating at this RPM allows the engine to produce enough power for essential functions without engaging in higher RPMs, which can lead to more rapid wear or overloading of engine components during idle conditions. This RPM range is generally recommended for marine engines as it aligns with the operational requirements of the RB-M 45 while ensuring longevity and reliability of the engine components.