These powerful four-cylinder four strokes have a chip on their shoulders. Actually it's more like a block - a big-block inline power head with a class leading 174.9 cubic inch of displacement. Suzuki's DF150 and DF175 may be compact and lightweight, but they pack a heavy punch. All these cubes, together with advanced features like dual overhead cams, enhanced air intake system with multi-stage induction, variable valve timing (DF175) and sequential multi-point electronic fuel injection ensure plenty of smooth power on tap. Superior torque and powerful gearing with a 2.5:1 final drive ratio help even heavy boats jump out of the hole and quickly accelerate to eye-watering top speeds.