(slidescan) Kenny Roberts on his Yamaha-500 during practice for the Dutch TT of 1981. He retired at the start of the race with brakeproblems. © Bert Visser

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(slidescan) Marco Luccinelli on his Suzuki-500 during practice for the Dutch TT of 1981. © Bert Visser

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(slidescan) Franco Uncini on his Suzuki-500 during practice for the Dutch TT of 1981. In the race he retired after 5 laps. © Bert Visser

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(slidescan) Graziano Rossi (Valentino Rossi's dad) on his Mobidelli-500 during practice for the Dutch TT of 1981. In the race he retired after 6 laps. © Bert Visser

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(slidescan) Graeme Crosby on his Suzuki-500 during practice for the Dutch TT of 1981. In the race he retired after 8 laps. © Bert Visser

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