Partially cleaned it up just now and removed the throttle shaft. Does not appear there is a bushing in there now. The shaft is egg shaped about 0.006" from what appears about 0.278" dia as measured near the unworn end by the lever arm. I stuck a 9/32 drill bit in the carb casting (0.281") and its a free fit that does not have a lot of slop. But not completely snug either. Not sure how tight is this supposed to be?
There is a brass ring pressed into the end I suppose from looking at exploded pix I found to be for keeping a felt washer in there. I think that felt must be long gone.
The drill bit fits with less slop than that shaft so maybe a new shaft and felt seal will take care of this w/o needing to bore out the casting and press in a bushing? It can't be any worse at least I suppose.
BTW, there is a brass tag with "TSX 97" and below that a "1" on one side of the rivet and "51" on the other. Is that a date code for Jan 1951? This is a '48 Z and originally had the louvered side panels. I don't have any recollection of the carb on this being changed but my memory only goes back to the mid 70s (born '66). This tractor was bought new by my grandfather. Could well be a replacement from back then.
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