Mercury - Active Trim Kit 40-60 HP FourStroke Single Engine 8M0111547. Overview. The Mercury Active Trim Kit (8M0111547) is designed for single-engine installations of 40-60 HP Mercury FourStroke outboards (Gen 5 models, serial number 1C453940 and newer). It automatically adjusts your engine's trim angle for optimal performance, fuel efficiency, and smooth handling - no need for manual trim adjustments.. Active Trim monitors RPM, speed, and running attitude in real time, trimming your outboard a