here are some pictures of engines made by J.A.Prestwich company of England. their first motorcycle engine was produced in 1903. production ceased in 1963. JAP made engines for all kinds of use, lawnmowers, airplanes, motorcycles, and automobiles. two of the most famous were the Brough-Superior motorcycle and the 3 wheeled Morgan auto. the little V/4 engine below is an airplane engine the others are all motorcycle or automobile engines.