Identifying the Weber DATR variants

[Betared]

Hi, my 1985 2000 Beta is fitted with a carb. with the following stamped on the flange at the base 34 DATR 2/250 BO. I have two others which have been cannibalised over the years and have 34DATR 2/250 F9 and34 DATR 1/250 G9 respectively.Can anyone enlighten me as to what the letters and numbers refer to specifically? I do know that the A means an automatic choke,which is a start.
Cheers,
David.

[Betared]

Hi, it's 6 years since I posted this question without any answers and we are working on another Beta with fueling problems so thought I'd try again to get an answer.

[HFStuart]

I don't know for sure but I suspect it was just the jetting  - there's almost no difference between the carbs. If you look at the technical data book the only difference between the 1/200 and 2/200 is the superfeed jet. Pretty much everything else is the same. I thought it might be venturi sizes going from the 1600 to the 2000 but no.

Classiccarbs.co.uk will sell you data sheets for £6 each so for £12 you could do a spot the difference.