Dellorto 17.5mm carb. Stock Yamaha carb is 15mm. The larger 17.5mm will add over performance. Suggested air filter be added at the same time. Increased fuel will need more air.
Carb does NOT come with auto choke. You may use your stock choke or purchase a new choke.
Pic shows carb with auto choke installed. Compare your stock choke for fit.