They were used in Grand Prix motorcycle racing powering Kim Newcombe to second place in the 500cc class of the 1973 Grand Prix motorcycle racing season, as well powering Rolf Steinhausen/Josef Huber to win two World Sidecar Championships.
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In the 1973 Grand Prix season, he gained his only victory in a race counting for world championship points when he won the 350cc class at the Spanish Grand Prix held at the Jarama Circuit.
He had his most successful years in 1973 when he finished in second place behind Giacomo Agostini in the 350cc World Championship, second in the 250 championship to Dieter Braun, and in 1976 when he finished second to his Suzuki team-mate Barry Sheene, in the 500cc world championship.