A SHORT HISTORY OF JAP
The following is another experiment in posting more detailed information online. Not having worked out how to display a pdf file, the following is in the form of images and some of the detail may have been lost. If you zoom to 200 or 300% you should be able to read the text but the detail of the drawings will still be hard to read.
Its an analysis of surviving JAP engine drawings and other information which attempts to create a history of the earlier speedway engine. Corrections and comments are most welcome either here or on the JAP Engines Facebook group.