Redesigned from the ground up, EXi Series Engines are equipped with the best of everything we have to offer. With the ReadyStart Starting System there is no prime, no choke, no worries-just pull for power. EXi Series is the first walk-behind mower engine featuring Just Check and Add so you\'ll never need an oil change-ever. Powerful, durable, easy to maneuver and easy to maintain, EXi Engine Series. It\'s engines made easy.