cycle parts were based on Triumph's well proven Triumph Model H side-valve. This had a poor reputation for handling, however, and was not really built for the more powerful four valve engine. On later models the oil system (which had relied on a manual hand pump) was replaced with an external oil pump. The 'Riccy' continued in production as a sports model until 1928.

Racing success

As well as developing the four valve engine, Harry Ricardo was also very interested in formulating new racing

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