1981 CR 125 carburation problems

I have some problems with the carburation of mine bike.
To solve them I think that the easuest way is to get back to the standard as set by the factory.
the issue is that i do not have the refernces.
can anyone help me?
thank you in advance

check HVA Factory for details on their website

prefere for
your bing T84 (32 mm )
needle jet 280 (276)

for your floating carb BING 84 !

thank you. my bike is a 1981 cr, with a mikuni carburettor

MIKUNI is not original parts !
(125 CR 1982= MIKUNI 38 mm )
bing 84 /32 mm yes !

possible picture ??