Yamaha F15SMHA Outboard Motor. 15-Inch Shaft Tiller Handle Manual Start Manual Tilt Gray. The Yamaha F15SMHA Outboard Motor delivers impressive 15-horsepower performance in a compact and lightweight 4-stroke design. Built for boaters who need portability without sacrificing power, this model is ideal for small fishing boats, inflatables, skiffs, and jon boats. With reliable manual start, tiller control, and a 15-inch shaft, the F15SMHA offers a perfect blend of simplicity, strength, and Yamaha d