This original choke lever (choke lever) is a mechanical control element of the starting system on the heavy-duty STIHL machines mentioned. Positioned in the area of the carburettor and the housing adapter (carburettor, adapter), it allows the user to manually open and close the air throttle plate inside the carburettor. Closing the choke during a cold start reduces the inflow of air and increases the vacuum that draws in a larger quantity of fuel, which creates the rich mixture necessary for successfully starting a cold engine. As an original OEM part, the lever ensures precise positioning and locking in the selected mode, preventing unwanted movement caused by strong vibrations during operation of the cut-off saw or drill. When replacing the choke lever, clean and unobstructed access to the carburettor must be provided by removing the air filter cover. Thoroughly clean the surrounding area of deposits of dust from cutting concrete, sawdust and grease. Carefully mount the lever on its pin or the connecting mechanism of the carburettor, taking care to properly engage all the locking elements or springs that define the position of the lever. Before completely reassembling the housing, test the travel of the lever by hand from the fully open to the fully closed position to make sure that the throttle plate in the carburettor moves completely smoothly and without any resistance or jamming. Key features Part type: Original part (OEM) Catalogue number (OEM): 4201 121 6600 (42011216600) Installation position: Carburettor and adapter system / starting controls (Carburettor, Adapter) Function: Manual control of the position of the choke plate for easier cold starting of the engine Material: High-quality engineering plastic of reinforced structure resistant to fuel and mechanical pressure Unit of measure: Sold per piece Compatible models STIHL cut-off saws and drills (older generation) STIHL TS 350 AVE (concrete and metal cutters) STIHL BT 360 (robust earth augers)