In the II/27 model, the magneto of the JAP 600 engine was located behind the cylinder,
II/27 1927 JAP Sidevalve 600cc, 15 PS
Developed from the Type I/26, the II/27 had the magneto positioned behind the cylinder, engine oil pump with sight glass, and engine power was increased to 18 hp.
In the same chassis was also the similar but considerably cheaper JAP roadster 550cc 14 HP engine, under the model name I/27. The following season these became models I/28 and II/28, and were unchanged.