Two-stroke engine

A two-stroke engine having:

• an ignition device;
• a combustion chamber defined by a piston;
• a scavenging port opening into the combustion chamber, the scavenging port opened and closed by the piston;
• and
• a scavenging passage allowing the combustion chamber to communicate through the scavenging port with a crankcase,
• in a scavenging stroke, intake gas pre-compressed in the crankcase being supplied through the scavenging port to the combustion chamber to generate a scavenging gas flow inside the combustion chamber, the scavenging gas flow squeezing burnt gas within the combustion chamber into an exhaust port, for exhaust, the two-stroke engine comprising:
• a separating wall confining a tip end portion of the ignition device;
• an ignition promoting chamber formed by the separating wall, the ignition promoting chamber independent of the combustion chamber and enclosing the tip end portion of the ignition device;
• and
• a plurality of communication holes disposed in the separating wall, each having a first opening that opens into the combustion chamber and a second opening that opens into the ignition promoting chamber, to allow the combustion chamber and the ignition promoting chamber to communicate with each other, wherein
• the ignition promoting chamber is arranged at a position where the scavenging gas flow has a relatively high flow velocity and/or a relatively high flow rate.