Cherub I Initial direct drive version introduced in 1923. Bore and stroke of 3.35 by 3.8 inches (85 mm × 97 mm) for a displacement of 67 cu in (1.095 L). 32 horsepower (24 kW) at 2,500 rpm.[2] Cherub II Geared down (2:1) version of the Cherub I. Cherub III An improved and slightly larger (1.228 L) direct drive version introduced in 1925.