Getting more time in the new aircraft. It has a stock 260HP IO540-C4B5. The prop is a MTV9B 3 blade. The engine is turbine smooth at 2650 RPM but has a noticeable vibration as you bring the prop back below 2600 RPM. Prop has about 870 hours total time and 50 since a complete overhual. The motor is at 870 since overhual. I would like to try and get the engine smooth across the normal operating range. Is a dynamic balance the best first step or are there other things to check first? All blades seem tight in the hub.
George
George