1934 Royal Enfield 250cc Jack Booker Replica. Jack Booker was the Enfield works rider, who had many successes on different capacity machines. The Booker 250, unfortunately, has not survived. Six replicas of his machine were produced in 1934 and this is the only known survivor. Bookers 250 was basically a 250 ohv Model BO, “250 Bullet”. Unfortunately, the valve gear was quite weak, but the bike was quick, while it lasted. It was quite capable of staying with the works 350 Norton’s, in mixed capacity races. If it was felt the bike was not going to last the race, Booker went for the lap record, and normally got that record before the rockers, usually, failed. Going down to the Melbourne Hairpin at Donington, Bookers bike was capable of 103 mph, not bad for a 1934 push rod 250. The replicas were still capable of a remarkably spirited performance for a 250 of that time. The replicas, like Bookers works bike, had a Dural con rod instead of the usual steel component; it is fitted with the rare 250 bronze head; it has an even rarer works petrol tank; it has a BTH racing mag: it uses a 350 frame and heavyweight close ratio gearbox; In it's present mild state of tune it is still capable of a genuine 80 m.p.h. There are a number of spares to go with the bike including a bronze head. It is road registered.