British Bikes

Post WWII till 1970

In 1948 the J2 model, with 'twin exhaust ports' and pipes, was released initially for export only. The J2 exhaust port split into two after the exhaust valve, so the difference was more for appearance.

The post-war J models had a rigid rear frame, and a four-speed Albion gearbox with an extra lever that the rider could press to find neutral. This was a simple, solid 499 cc push-rod single with 84 mm bore x 90 mm stroke and a compression ratio of 5.5 to 1. It also used a fully floating white metal big end, similar to those found in radial aircraft engines, with the usual felt oil seals, Amal carb, and Lucas magneto ignition. The fully floating white metal big end could be replaced with an aftermarket caged roller bearing conversion. By 1950 the compression had been raised to 5.75 to 1, with a claimed power output of 21 bhp at 4,750 rpm. These were essentially torquey sidecar machines.

In 1949 the first new models were introduced: the 350 cc full sprung Bullet, and a 500 cc twin. The sportier alloy head, swing arm frame 350 cc Bullet was a sensation. It was the 1954 350 cc Bullet model which was to be made in India until the present (read further down). In 1953 the 500 cc model appeared, using the same bottom end. After 1956 a new frame was introduced in the British-made version of the Bullet, making it different from the 1954 model still being produced in India. The British made version was manufactured until 1964. The Bullet 350 and 500 also used the fully floating big end design.

Bullet motor cut away

The new swingarm frame 500 cc twin of 1949 would eventually evolve into the Interceptor. The 500's big end had no bearing inserts, the machined con-rod running directly on the crank pin. In the 1956 700 cc Super Meteor, a development of the 500, conventional babbit bearings were fitted, and were used on all subsequent vertical twins.

The 500 cc Bullet engine produced 25 bhp at 5,250 rpm while torque peaked at 29 ft·lbf @ 3,600 rpm, From 2,000 rpm onwards torque did not fall below 25 ft·lbf till beyond 5,300 rpm.

1956 Twin 500

Later models like the 250 cc Crusader (1957) and 700 cc Meteor (1955), were followed by the 250 cc Continental GT (1965), the 700 Constellation (1959), available with Royal Enfield's "Airflow" full fairing, and the 736 cc Interceptor (1963).

During the onslaught of the Japanese motorcycle manufacturers in the late sixties and early seventies, the English factories made a final attempt with the 1962 - 1968,[8] series I and Series II. Made largely for the US market, it sported lots of chrome and an engine performance with less than 14 seconds to the quarter mile at speeds well above 175 km/h (105 mph). It became very popular in the US, but the classic mistake of not being able to supply this demand, added to the demise of this last English made Royal Enfield.[9] The Redditch factory ceased production in 1967 and the Bradford-on-Avon factory closed in 1970, which meant the end of the British Royal Enfield.

1961 Fury

After the factory closed a little over 200 Series II Interceptor engines were stranded at the dock in 1970, originally on their way to Floyd Clymer in the US, but unfortunately he had just died, and his export agents, Mitchell's of Birmingham, were left to dispose of them. They approached the Rickman brothers for a frame, and the Rickman brothers' main problem had always been engine supplies, so a limited run of Rickman Interceptors were promptly built.

As far as the motorcycle brand goes though, it would appear that Royal Enfield is the only motorcycle brand to span three centuries, and still going, with continuous production. A few of the original Redditch factory buildings remain (2006) and are part of the Enfield Industrial Estate.

1968 Interceptor