Exi SeriesT 7.25 GT 163cc Vertical Shaft Engine. This genuine 163cc Briggs and Stratton engine offers dependable power without sacrificing ease of use and user comfort. Advanced engineering delivers a lighter, quieter and smoother operating experience, and the ReadyStart no-prime starting system translates into fast, easy starts. ReadyStart® starting system with no prime, no choke, no worries, just pull for power. Dual sealing air cleaner for improved debris resistance and longer life. Lightest engine in its class by 30% for easier maneuverability.