Congratulations.
You have a pair of Hitachi Su's used on the A12GX motors.
They look nice and clean and almost brand new.

Damn.
I wish I was near enough to have bought them.
I bought a spair pair just to clean them and find that the butterflies has been worn on the sides of the shafts about a millimeter.
If you close the butterfly and hold the carb in to the sun, you can see a small amount of sunlight coming in on the sides of the shaft.
The people I talked to said this will cause problems when setting the idle.
I am so pissed.