The Lawn-Boy 20 in. Kohler engine Variable Speed Self-Propelled Mower features a timeout blade stop system, which allows the engine to run but stops the blade so operator can safely pick up obstacles or empty bag without restarting the mower. The 7 in. front and 8 in. rear wheels provide solid traction to maneuver around all types of terrain while the multi-notched blade cuts grass into fine clippings for a clean cut.