A two-stroke, internal combustion engine which includes at least one set of paired first and second cylinders. The engine includes an air or air/fuel mixture inlet conduit bifurcated into inlet passages extending to respective first and second inlet ports of the first and second cylinders. A valve controls the passage of air or air/fuel mixture into the inlet passages. In one embodiment of the engine, a bypass passage provided with a bypass valve extends between the inlet ports of the paired cylinders.