2018 Mercury Marine® FourStroke 2.5 HP Handheld Reliability Portable power and thrust for exact operation. Features may include: Shallow Water. Multiple trim positions enhance performance and enable shallow-water operation. Precise Control. Mercury 2.5 and 3.5hp FourStroke engines feature neutral-forward shifting with 360-degree steering for full thrust in all directions. Lightweight. Weighing just 38 and 57 pounds, respectively, our 2.5 - 3.5hp and 4 - 6hp FourStroke outboards are easy to lift and carry. Easy to Start. Automatic decompression bleeds off cylinder pressure to reduce the pulling force required to start the engine.