The GSX-R750 was a product of the factory GS1000R racebike that found success in AMA and Endurance racing. Sold as a 400 in Japan in 1984, the upgraded 750 of 1985 came to buyers garages with a race-bred 100 horsepower, DOHC, inline four-cylinder, air- and oil-cooled (Suzuki Advanced Cooling System—SACS) motor with 70 x 48.7mm dimensions, 29mm flat-slide carbs, aluminum box section chassis, 18-inch wheels, and bodywork that looked straight off the Endurance racetracks of the world. The air and oil cooled models can be divided into the first generation and second generation, colloquially referred to as 'slabbies' and 'slingshots' respectively. The bike continued to evolve, with water-cooled versions from 1996 and then Suzuki's SRAD (Suzuki Ram Air Direct) from 1996 through to the 2018 models. Since 2011, the L1-L7 models have been largely unchanged.