The Incredible Cummins Indy Car Go-Kart Collectors Can't Stop Chasing: The Real Story Behind Bird Corporation's Wild Racing Replicas

Bird Corporation’s Indy car-style go-karts fuse collectible appeal with functional racing design, as seen in a bright yellow Cummins-inspired replica finished in the familiar #25 livery associated with Al Unser Sr.'s 1987 Indianapolis 500-winning machine. Bird Engineering, founded in 1959 in Omaha before moving to Fremont, Nebraska, built a range of go-karts, minibikes, and three-wheelers, with bird-themed names like Hawk, Eagle, Starbird and Baja that became part of the brand’s identity. These machines used tubular steel frames, Briggs & Stratton or Tecumseh flathead engines, a centrifugal clutch, and rear-wheel drive; brakes evolved from scrub to drum systems over time. After an early-1980s acquisition by Phoenix Engineering, the brand persisted under Bird Corporation and related names, keeping these replica collectors’ items in demand.