| 摘要 |
PROBLEM TO BE SOLVED: To provide a safety driving and prevent exhaustion of unburnt fuel (HC-hydrocarbon) by avoiding irregular combustion in a low rotation and a low load of an engine and preventing the rotation fluctuation and an accidental fire. SOLUTION: This crank chamber compression type general purpose two-cycle engine is provided with a bleeding port perforated in a cylinder, opened to a combustion chamber, and opened/closed by reciprocating motion of a piston, a communication passage communicating between the bleeding port and the crank chamber, and a bleeding valve opening the communication passage in the low rotation speed or the low-load driving of the engine, making air-fuel mixture in the combustion chamber pass through the communication passage, and introducing it to the crank chamber, and bleeding valve opening/closing means connected to a control lever of the engine, releasing the bleeding valve when a throttle opening is small, or a prescribed opening or less, and introducing the mixture in the combustion chamber to the crank chamber.
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