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The Lincoln L21B uses the new Briggs & Stratton EXi Series Engines. With the ReadyStart Starting System there is no prime, no choke, no worries - just pull the power. The 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 maintain, the EXi Engine Series is an engine made easy.