Patent ID: 7055502

Claim:
A single cylinder engine comprising: an engine body including a cylinder, a combustion chamber, an intake opening that faces the combustion chamber, and an intake passage in communication with the combustion chamber through the intake opening; a piston provided in the cylinder; an ignition plug arranged in a position within about 5% of a bore diameter of the cylinder from an axis of the cylinder; a throttle valve provided in the intake passage; an injector that injects a fuel into the intake passage; a detection device that detects an opening degree of the throttle valve and an increasing rate of the opening degree of the throttle valve; and a control device that causes the ignition plug to lag in ignition timing during two or three cycles when the throttle valve is increased in opening degree from an idling state; wherein when the increasing rate of the opening degree of the throttle valve is a predetermined value or more, the control device causes ignition timing to lag and increases a fuel injection quantity of the injector during the two or three cycles.