G'day Norm
You have asked a most interesting question.
I feel compelled to say something - as a non expert...
One of the features of the carby was
less fewer parts.
I feel they are a 'reliable' carby ... but not a 'performance' carby.
I have just updated the record on the G4 carby.
I know it needs more work and input.
I feel it was revolutionary ... but a compromise in terms of performance.
Adjustments were limited.
G4 Carby Design and Bulletin ---------------------
Jack