He says that the power-dense rotary four-stroke engine prototype’s basic architecture is pretty much the same as that of the X2, which shows the scalability of the engines. The X Mini has a 4 lb ...

Designed for hand-held equipment, the GX25 mini 4-stroke engine weighs only 6 pounds and features a .29-kW/kg power-to-rate ratio. It replaces the GX22. Mechanical decompression provides easy start-up ...

The Z125 is fitted with a 4-stroke, one-cylinder, SOHC, 2-valve, fuel-injected 125cc air-cooled engine pushing it to a top speed of 64 miles per hour. It's mated to a four-speed manual ...

The NR-200 is a four-stroke water-cooled engine with a displacement of 8.6 cubic centimeters and an electric starter and has an operating range of 3,000-18,000 rpm and a maximum speed of 22,000 rpm.