![]() He said later, “I never regretted the decision.” Yamaha built a works version in record time and debuted it at the 1973 Belgian 250 Grand Prix in Wuustwezel with Swede Hakan Andersson on board. Tilkens was tired of waiting for Suzuki to make up its mind and took the Yamaha offer. But, while Suzuki waffled back and forth, Yamaha made Tilkens an offer for his single-shock suspension design. Roger’s and Sylvain’s positive tests resulted in Suzuki mulling over whether or not to buy the concept. In 1968, Tilkens built a single-shock CZ for his son Guy to race and, after several years of testing, Lucien took the initiative to have Suzuki’s Roger DeCoster and Sylvain Geboers test the single-shock idea in 1972. Tilkens believed that a single shock would work better than the twin shocks of the era. The single-shock design came from Belgian college teacher Lucien Tilkens. The 1975 MX400B was catnip to the American motocross market. ![]() ![]() Pumped up by Hakan Andersson’s 1973 250 World Championship and Pierre Karsmakers’ dynamic 1973 AMA 500 National Championship, Yamaha was ready to take the works Monoshocks (originally labeled the Monocross by Yamaha) from the limited-production 1974 YZ models to mass-production machines in 1975. ![]()
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