Buy 2021 Mercury 4 HP MH Outboard Motor Online is perfect for small fishing boats, small t-sized inflatables, and sailboat auxiliary power. The Mercury 4 HP outboard engine model 4MH is compact and lightweight and comes equipped with the short 15-inch shaft, manual start, tiller steering, and full forward-neutral-reverse gears with twist grip throttle, Mercury 4hp models feature an integrated 1-liter fuel tank for real portability. External tank connection is standard which makes adding an external fuel tank and line quick and easy.