2003-05 Yamaha YZ450F
The third-generation YZ450F was Yamaha’s first to bump up against the maximum allowable displacement for AMA National Motocross competition. a 62.4mm stroke pushed the total displacement to 449cc, with the engine now producing more than 52 horsepower. The YZ450F represented such a leap in performance that Yamaha opted to fit it with a four-speed transmission rather than the five-speed found in the previous two versions. A new chassis and new bodywork were also used, as was a new KYB twin chamber cartridge fork, helping to lower weight from 250 lbs. into the low 230s.
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