by Sam Burns
J.A.P Prestwich, otherwise known as J.A.P.
In the early years of motorcycle manufacturing, many manufacturers used bought-in engines for their motorcycles as the cost of developing engines was beyond the means of many of them. Of all the manufacturers of proprietary engines, possibly the most famous was J.A. Prestwich, otherwise known as J.A.P.
Without the J.A.P. engine, many British motorcycle manufacturers would never have got off the ground and, over the years, J.A.P. supplied engines to Brough Superior, Triumph, AJS, Enfield, HRD-Vincent and Zenith, as well as manufacturers in France and Germany.