STOP-START SYSTEM FOR A SADDLE-STRADDLING TYPE MOTOR VEHICLE

At the time of a stop of an engine (10), in a state in which air is flowing into a combustion chamber (31 a), a crankshaft (13) is rotated in a forward direction by inertia without combustion of a fuel-air mixture. At the time of start-up of the engine (10), the crankshaft (13) is rotated in a reverse direction, and an intake port (21) is opened and the fuel-air mixture is introduced into the combustion chamber (31a) when a crank angle is in a start-up intake range. Thereafter, the fuel-air mixture in the combustion chamber (31a) is ignited when the crank angle is in a start-up ignition range. In this case, the crankshaft (13) is driven to be rotated in the forward direction by the energy generated by an explosion that occurs in the combustion chamber (31a).