A toy motorcycle is mounted on and supported by a front wheel and a driven rear wheel which is heavy enough to act as a flywheel. A pull string mechanism includes a spring biased spring spool having a gear, with a step-up gear train imposed between the spool gear and the rear driven wheel. A centrifugally operated pawl mechanism is driven by the gear train to couple with ratchet teeth formed on the rear wheel in order to drive the rear wheel in one direction and to decouple from the ratchet teeth when the gear train is driven in the opposite direction during string recoil. The rear wheel has a greater moment of inertia than the other components of the pull string drive mechanism to enable the rear wheel to function as a flywheel and thereby store energy to drive the motorcycle. A reed is positioned to be plucked by a rotating cam to produce sound.