Carb Rotary Valve for 2 Stroke 43/52 CC Petrol Brush Cutter, Earth Auger & Water Pump, BC-018

Carb Rotary Valve 

The "Carb Rotary Valve" in a 2-Stroke 43/52 CC Petrol Brush Cutter, Earth Auger, or Water Pump (BC-018 type) typically refers to the throttle butterfly valve mechanism within the carburetor. It is a rotating disc mounted on a spindle inside the carburetor's air passage (venturi).It functions as the throttle, directly controlling the volume of the air-fuel mixture entering the engine. When the operator engages the throttle, the valve rotates, opening the passage to allow more mixture through, thereby increasing the engine RPM (speed and power). When the throttle is released, it closes to an idle position.