Deloretto 28mm Carburettor - Need info...?

Question

Need info on Deloretto Carburettor, especially 28mm slide carb with 3 jets and square float chamber

Answer 1

Check the manufacturers website:
http://www.dellorto.co.uk/

Dellorto's been making carbs since at least the 60's, they came stock on many bikes (including KTM until just recently), so your description doesn't give enough information to determine the model, or the application.