These Suzuki GSX models were the evolution of the GS series of 2-valve per cylinder air and oil cooled four stroke motorcycles. The first 4-valve engines were produced for the 1980 model year, but retained the "GS" designation for the US and Canadian markets until the release of the GSX-R models in 1986 (1985 outside the US). These GSX engines were based on Suzuki's "TSCC" (Twin-Swirl Combustion Chamber) engine design, and shared little with previous 2-valve models. The bike called Suzuki Katana in the US had this engine design, with designations of GSX-S, but has little in common with the more modern GSX-F Katanas, which are sport-touring bikes.
The early GSX four-cylinder engines are arguably among the most reliable motorcycle engines ever mass-produced, with the 1100cc and 1150cc engines still very commonly used for drag racing and hillclimbing competition in the US.
The TSCC engine was once again redesigned in 1983 with the introduction of a completely new GSX 750, Suzuki's first modern mono-shocked sportbike in both a naked (GSX 750E) and half-faired (GSX 750ES) version. Although this bike received solid reviews from testing magazines (and came to be the testers' preferred 750 sport machine for the year), its release was an ill-timed duel against Honda's all-new V4 engine in the form of the VF750 Interceptor.
The 1983 GSX 750ES was a ground-breaking model in its own right, with air-adjustable anti-dive forks, preload and compression-adjustable rear mono-shock ("Full-Floater"), disc brakes at both ends. Some of the futuristic features it pioneered, like a fuel gauge, have since become far more commonplace. Others, like the digital gear indicator, turned out to be redundant marketing ploys now considered retro and obsolete.
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