Yamaha DT2MX carburettor float bowl carb was stamped 313 E1 and is a Mikuni VM30 , This may fit other similar bikes of the same era but you will have to study pics carefully to ascertain this 

Bowl is in excellent condition with a very slight bend in the exterior overflow spigot see pic 3 , there is no access plug but threads first class condition and there are the 4 original screws in perfect condition plus the overflow tube guide 

Feel free to message me for any more information

SL= DT2 MX Carb box