Suzuki's GSX400E: How 1980's TSCC 4-Valve Tech Kept It Alive

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In 1976, Suzuki moved its lineup from two-stroke to four-stroke engines, launching the DOHC inline-four GS750 and the DOHC twin GS400. The 1980 GSX400E introduced Suzuki's TSCC technology, converting the combustion chamber from two valves to four and shaping twin domes around the intake and exhaust valves to generate swirl for better combustion efficiency — credited with giving the model its lasting popularity.