Suzuki's GSX400E Proved a 4-Valve Twin Could Outlast the Four-Cylinder Wave

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Suzuki's 1980-82 GSX400E paired a DOHC 4-valve air-cooled parallel twin with a TSCC-style combustion chamber, delivering 44ps at 9,500rpm and 3.7kgm at 8,000rpm from its 399cc engine. A 180-degree crank and balancer shaft let it spin smoothly to high revs. It was Suzuki's deliberate twin-cylinder answer in the 400cc class even as the GS750 and GS1000 pushed the brand toward four-cylinder engines.