I think the JAP engine is one of the most beautiful engines ever made and so quintessentially British. I was offered an ex-speedway JAP motor back in the 80s by Dennis Rogers a well known Nottingham motorcycle breaker (and handy pilot of his red Morgan called The Wandering Blob) for about twenty quid. Sadly and to my eternal regret I turned it down.
Ian
Actually coming to think about it Dennis always claimed he was the wandering blob not the Morgan!