Re: Leaking fuel from carburetor.
Check with John at www.aircooled.net.
Get a NEW carb, not rebuilt. I am not sure if John even sells rebuilt carbs. John has the Pierburgs. He most likely has Bocars or Kafers too. Not really sure on the brands of what he has other than the Pierburg.
Aircooled.net is an excellent source for parts and of the few years I have been dealing with him I have no complaints.
Dave