For What It's Worth, My 123 with a K301 does not have the balance gears, my 125 with a K301 does have them. It's been a long time since I rebuilt the 123 engine, but I do not remember seeing stub shafts in the 123 crankcase.
I don't have the spec numbers in front of me at the moment, but I could get them if it matters. Both engines are original to the tractors as far as I know.
It was a PITA to get the index marks to line up when I rebuilt the 125 engine, but I did it. I found out later that I could have just let them out.
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