John Deere pony carbs are basically the same. Parts are available for those here:
http://www.robertscarbrepair.com/piccategory.asp?id=362
There is an excellent thread in the archives on carb rebuilding that Neil posted as he rebuilt his. You can search for it with the search function in the upper right portion of the page. Maybe Neil will chime in and steer you to it.
Hi Jamesemu, I purchased a rebuild kit from 'The Carburetor Doctor'. Here is a link to the $5.00 download for the 10 page overhaul manual...
http://www.carbkitsource.com/manuals/carbmanuals/CM927.html
Good luck.
I have a pdf of the service manual and a later D2 (5U13237+) parts manual if you want them. Not sure how close the parts manual is to your machine but may be better than nothing.