| 摘要 |
Disclosed herein is a lawn mower including a blade housing, wheels for supporting the blade housing for movement along the ground, a rotary blade supported in the blade housing, and an internal combustion engine supported by the blade housing and rotatably driving the blade. The internal combustion engine includes a carburetor, a movable throttle control for controlling fluid flow through the carburetor, the throttle control being movable from an open position to a flow restricting position, a movable air vane connected to the throttle control for moving the throttle control, and a fan for forcing air against the air vane and for urging the throttle control to the flow restricting position. The engine further includes a spring connected to the throttle control for urging the throttle control to the open position, and a control member connected to the spring, the control member being movable between a first spring force level position and a second spring force level position for varying the force of the spring on the throttle control.
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