Hi Dutch and Raj
Sorry I made the same mistake ????
Its a J.A Prestwich engine,
a 250 dry sump twin port, mated to a BSA C12 lightweigh gearbox all housed in a modified Enfield frame and a girder front fork
Raj
First letter "P" is not the date year, its the 250 engine designation
That type ohv engines were not made in 1920
The first ohv's did not have a rocker box, every thing exposed and the rocker mountings cast on the head
(known as dog ear)
I have gone through a few J.A.P engines and am reasonably familiar with their history,
Unfortunately the factory records are long gone, but the * usually denotes a customer required option
During the thirties they offered no less than 7 different style cylinder and head styles that all contained the same working parts
They would also put the customers name on the timing cover or on the crankcase
I had a 250 engine that had OK cast on the head and cylinder and an OK Supreme badge on the timing cover
I had rebuilt this and was going to fit it to my 1932 OK side valver,
A bad back injury and a wanted ad in the VMCC magazine made me decide to sell it
John
