Engine
The XS400 featured a four-stroke, air-cooled, overhead-cam engine that is commonly called a "parallel twin". While the twin cylinders are indeed parallel, the two pistons are offset 180 degrees of crankshaft rotation -- this arrangement greatly reduces linear vibration at the cost of some axial vibration. The 392 cc (23.9 cu in) engine produced 36 bhp (27 kW) @ 8100 rpm.
Read more about this topic: Yamaha XS400
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