KZ440 KEIHIN 1391 TH28 Carb ID?

Hi Everyone,

I just joined and wanted to know if you can help me? I have a 1981 KZ440 with a KEIHIN carb (1391 TH28) long story short, I broke off the air pilot screw in the carb and now need to replace it (its a goner, already made several attempts to remove it). I am looking on ebay and found similar carbs, but the numbers don't quite match. The one on ebay has a number of 1391 TD27 and mine is a 1391 TH28. Here is my question, Do you guys know what the difference is between them?