The stock was an Encarwi H12. I could never get that thing to run right. The new carb is a Delortto SHA 15.15. No air/fuel adjustment. Only a main jet. It has a lever-style choke and only one main throttle slide. I bought an array of jets to go with it. However, the one that came with it ( I believe is a 62 or 65) seemed to be operating pretty well.