AJS and Matchless Owners Club Limited

AJS & Matchless Owners Club

Machine History - 2-Strokes

Y4 Scrambler
37A Trials


The history of this two-stroke engine began in 1962 with a scrambles motor, the 'Starmaker', designed by Bernard Hooper and John Favell. This was later taken up by Peter Inchley, who developed a Villiers special road-racer that became known as the 'Starmaker AJS'.

The 250cc scrambles version, known as the 'Y4', later became the 'Stormer' and brought the initials AJS back into the headlines with Malcolm Davies winning the 1968 British Championship.

Running alongside the 250cc bike, AJS enlarged the engine size to 370cc and called this the 'Y5'. In a slightly modified guise, the 250cc and 370cc models were exported to the USA as the 'Y40' and 'Y50' respectively. In 1971 the 'Stormer 410' was introduced.

In 1974 the lineage was taken over by the Fluff Brown AJScompany, who continued to make and service the scrambler, which became known as the 'FB AJS' and went on to introduce an enduro version. The AJS initials, being almost the sole legacy of the original Stevens brothers, now adorn the splendid machinery turned out from the 'AJS Motorcycles Ltd' based at Andover.

37A Trials

Built only in 1969, the AJS 37A-T trials bike was developed in the heart of the Cotswolds by Malcolm Davies.

An extremely robust lightweight, with the frame developed from the immensely strong AJS scrambles model, the 37A-T was assembled at the Norton Villiers plant in Andover, Hampshire.

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