PURPOSE: To facilitate starting, by accumulating the turning force of a rear wheel of this autobicylce to a force accumulating shaft provided with a spring through a link mechanism.

CONSTITUTION: A rear axle 40 is interlocked with a crank-shaft 14 of an engine 12 through a belt 30. An intermediate shaft 58 connected to a kick pedal 94 through a bell crank 72 as a motion converting means and a rod 80 is connected to an eccentric cam 68 mounted to the rear axle 40. A feed pawl portion material 64 and an oscillation arm 96 are arranged to the intermediate shaft 58, and push an interrupting portion material 84 on the rod 80 to prevent the backlashing of the cam 68 while the positive turning force of the cam 68 is accumulated to a spring 54 disposed onto a force accumulating shaft 56. A one-way transmission means 48 consisting of a pawl wheel 56, etc. is arranged to the force accumulating shaft 56, and turning force accumulated to the spring 54 is transmitted to a crank-shaft 14 when starting.