Thank you Gray Beard for the suggestion. I did contact Tower, but they were unable to assist. Got the "that product was discontinued, thank you for your inquiry" response. I do recall seeing somewhere that the TH 61 was very similar to another brand of engine that I'm not familiar with. I think it was a GMS?? Not sure of the brand name. All I know is that I wasn't familiar with it. May try and track down a carb for that style of engine, once I figure out what it was.