This Carb is used as a replacement carb on some Alpina, Matador, Pursang, and Sherpa S models. Adapters are needed for some models. They come pre jetted for each model if You supply the serial number. Some models may need fine tuning. The engine side dimension of the carb is 40mm and the air box side of the carb dimension is 58mm.
Mikuni Carburetor 30mm
Please supply your Bultaco motor serial number so we can jet the carb for your application.