Tonkin, the Typhoon with the G50 Matchless motor.
there not macles engens
The A.J.S. 7R had a single cylinder 350 c.c. over head cam engine producing 40 plus brake horse power, and with a power band in the 6000-7800 r.p.m. range, and with a lightweight frame made for an exceptional junior racer which offered close class racing that showcased the skill of the riders. In 1960 the motor was redeveloped into a 500cc, which was re-badged as the Matchless G50.