Here is a pic of Mara riding Buzz's 1957 NSU scooter after getting it running. She cleaned and rebuilt the BING carb and got it running like a champ. Unfortunately the the drive shaft made a bunch of noise and we couldn't ride it that much.
Here she is cleaning the carb. The bingcarb was a slide carb with a side float, it is the same set up as a hummer carb.