| 摘要 |
A two-stroke internal combustion engine, in particular for portable tools such as power saws, bush cutters, etc., comprising a bed (2) in which for the reciprocating piston (8) at least one chamber (44) is provided to which the mixture inlet port (20) and the spent gas outlet port (30) are connected, characterised in that the spent gas outlet port (30) is provided with a valve (32), the opening and closure of which are controlled by the rotation of the piston crankshaft (16).
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