ABOUT US
The patriarch of the Hahn clan, Bill Hahn Senior, blazed new trails throughout his famous career. From an early age, Senior, a hot rodder, followed the siren song of Route 66 and took that renowned highway from sweet home Chicago to idyllic Los Angeles. He founded Action Fours in 1969 upon the debut of the equally trail-blazing Honda SOHC 750 Four. Seriously inspired by this fantastic new motorcycle, Bill took his new company to the top of the high-performance world that served these exciting new machines. Bill Sr’s next move was radical and revolutionary. He sold Action Fours and embarked upon his newest venture, a firm he dubbed American Turbo-Pak (ATP). His groundbreaking turbocharging system would revolutionize two-wheeled performance forever, igniting a spark of motorcycle turbocharging that has burned brightly ever since. Soon ATP had systems for many bikes, with substantial worldwide sales.
