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Longitudinal equations of motion for the rider/motorcycle system are deduced. The rider's body is assumed to be composed of lower and upper leg, pelvis part, torso, head, lower and upper arms. The motorcycle is composed of front wheel with suspension, rear wheel and motorcycle frame. Equations of motion are obtained for each part. The actions and reactions working at the joints or connecting points are considered.

The dynamic behavior of the rider/motorcycle system, affected by the change of rider's posture in jumping over an obstacle, was analyzed by solving the equations of motion. The rider's behavior and motions were obtained from full scale experiments. These were combined with dynamic equations of motion for the motorcycle. The result was used to evaluate the rider's mastery of the accomplishment of the movement. To compare with the real motion obtained with a high speed camera, the computed motion was visualized as a time sequence. The comparison between the experiment and the computation showed good agreement.