Bluebird B424B Walk-Behind Aerator 17", Briggs 900 Series EngineBluebird B424B Walk Behind Aerator 17", Briggs 900 Series Engine Features: Homeowners and landscapers who want a powerful aerator in a compact design need not look farther than the 424 The machine is simple to use and features a working width of nearly 18 to aerate over 20,000 square feet per hour The 424 is easy to maneuver, while the built in lift handles and removable front weights assist in the loading process The clutch lever is integrated into