Importance

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Abstract

An engine-powered work tool includes an air-cooled engine having a crank shaft, an engine output controller, a wind governor including a governor plate, and a throttle-opening assisting mechanism. The engine output controller includes a throttle valve shaft angularly rotatable about its axis for controlling a rotation speed of the crank shaft based on the angular rotation of the throttle valve shaft. The governor plate is connected to the throttle valve shaft for receiving cooling air generated by a cooling fan connected to the crank shaft. The wind governor controls angular rotation of the throttle valve shaft based on an amount of the received cooling air. The throttle-operation assisting mechanism causes the throttle valve shaft to angularly rotate in a direction to increase the output of the engine within a prescribed rotation speed range, the operation by the throttle-operation assisting mechanism being predominant over the control by the wind governor.

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First Claim