The prototype car was SE492 chassis number 638, which was modified to add additonal bracing to withstand the extra power and weight of the four-stroke engine, a taller bonnet (US hood) with large grille to accommodate the engine, and unfaired headlights. In mid-February 1959 this car spent two weeks at the Royal Enfield factory, during which time it covered 500 miles of general road use and 1,000 mi (1,600 km) of endurance testing at MIRA.
By the time of the press release announcing the launch of the B95 in March 1959, a further 2,500 mi (4,000 km) of road and track tests had also been carried out by Berkeley factory drivers. Perhaps to address the reputation for breaking down that the two-strokes had developed, especially in export markets, it was emphasised by the factory that during this testing there had been no involuntary stops or any form of mechanical failure, and that further testing would be performed until a total of 15,000 mi (24,000 km) had been completed.
At its launch, the B95 cost £659 (equivalent to £11.4 thousand today). About 200 B95 and B105 models were made, with chassis numbers following-on from the SE492 series and chassis number 670 (the earliest known B95) was registered at the end of March 1959. The first B105, chassis number 686, was delivered about one month later.
About half of the four-stroke cars were exported, and both the B95 and B105 were in production at the time the company was declared insolvent in December 1960.
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