I am currently working on building my first café racer. It's a Honda CB 750 super sport 1975. Clean the carbs and let them sit in a 50-50 mixture of Pine-Sol and water with much scrubbing. I purchased a carb rebuild kit from vintage Honda 750, it looks like the kit did not come with the emulsifier tube, which I originally thought was the main jet? I'm just a little confused? Kit does fit (from the website description) my model.