I note that Tuna uses a Bocar 30 Pict-1 on his Imp. Can you really make that carb work?
The carb was a new one that I had purchased when I was working at a VW shop in Redlands, CA. After purchasing the Imp, the carb on it wasn't cooperating, so I used this Bocar to see if I could get it working. It fired up with no hesitation and it's been running on there for the last ~13 years. I can't complain about it, it's worked perfectly day in and day out.
Tuna