Air-leading type stratified scavenging two-stroke internal combustion engine, and engine working machine

An engine-driven working machine, comprising an air leading type stratified scavenging two-stroke internal combustion engine as a power source,

• wherein the air leading type stratified scavenging two-stroke internal combustion engine, comprising:
• an air passage configured to allow supply of air to a scavenging passage configured to allow communication between a crank chamber and a combustion chamber;
• at least one sensor configured to detect an operating condition of the engine;
• and
• a fuel valve configured to control fuel supply to the air passage based on detection performed by the at least one sensor,
• wherein
• the fuel supply to the air passage is controlled by the fuel valve at times other than start and idling of the engine or at needed times in addition to the start or the idling of the engine, and
• the at least one sensor includes any one of a sensor configured to estimate a temperature of the engine, a sensor configured to estimate an accelerating operation of the engine, which is performed by an operator, and a sensor configured to estimate a decelerating operation of the engine, which is performed by the operator.