Good quality replacement automatic choke for all Chinese-built 4-stroke carburettors and many Kymco, Peugeot, Piaggio, Yamaha and MBK 2 stroke 50cc scooters with the Gurtner or Dellorto carburettor. Straight swap for old choke. Please check your current component against that in the image as there are numerous types of chokes used. On some occasions with the Piaggio engine scooters you may need to change the connector block over. Dimensions: Mounting sleeve diameter: 20mm Plunger diameter: 7mm Plunger length: 11mm Needle diameter: 2mm Needle length: 9mm NOT SUITABLE FOR WALBRO CARBS