We have seen this before, and had this discussion before ?
That engine is shown in "British 250cc Racing Motorcycles" book as the
Ronald Peck Special. A draughtsman from Redbourne in Herts.
Construction of the engine was finished in 1953, just for interest it was said,
and it was initially assembled into an old New Imperial frame.
Syd Mularney acquired it in 1958, and Brian Setchell raced it at Silverstone.
A lot of time was spent trying to develop it, but was sold in 1965.
There is a pic of Peck on it as it was in 1958, will scan and post.
Last time we saw it, you were doing something to it - valve guides perhaps ?