Robb began riding in trials and during 1950. His first event was a road time-trial riding a 197 cc James. He then competed on Irish grasstracks, winning six national titles and a 25-mile sand race between 1954 and 1956, before turning to short circuits on tarmac and road-racing. His first road race was at Lurgan Park, outside of Belfast, in 1957 riding a 197 HJH. He was noticed by Belfast sponsor Terry Hill, himself a trials rider, who provided a 173 MV and a 250 cc NSU Sportmax for 1957 and 1958 with Robb finishing third in the 1957 Ulster Grand Prix and second in the 1958 race.

Robb was then sponsored by tuners Geoff Monty and his business partner Allen Dudley-Ward until joining the works Honda team from 1962, winning his first world championship race in the 1962 250 class at the Ulster Grand Prix with two further wins at the inaugural Japanese Grand Prix in Tokyo.

In the 1962 season, Robb became one of the first non-Japanese riders hired by the Honda factory racing team. He enjoyed his greatest success with Honda, finishing second to his team-mate, Jim Redman, in the 1962 350 world championship.

In 1973, he won the Lightweight 125 TT at the Isle of Man TT races, aboard a Yamaha. He was also a five-time winner of the North West 200 race in Northern Ireland.

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Wikipedia