The 2012 E-Series engine line-up from Briggs & Stratton offers reduced emissions and one-step starting. Design improvements to the 625e, 675ex, and 725ex Series engines include one-pull starts and a starter rope, and an optional electric start. A strengthened cylinder design reduces bore distortion for less friction and wear. The replaceable Maxi-Clean air cleaner captures dirt and debris. The Super Lo-Tone muffler reduces noise levels and improves tonal quality.