djgjames:
Just wondering if you are the dirt digger james that is the troy bilt tiller man?????
About your little 2 cycle tiller. I have some of them little fellers that I use for the same as you, getting between the rows and tilling in compost and wife uses them in flower beds. Really good as weed control. I use the big un's when first starting in early and late season. Also be sure and do the proper mix. Seen one few days ago that was 24:1 mix and owner said it was getting hot. Was ok when I doubled the 50:1 mix.
I have had the same issue as you are experiencing with them carbs on them little 2 cycle tillers. I can sometimes clean the carb and get a run but kinda a surprise when I get a good run. I just replace them, I buy from Amazon Prime and if one does not go it usually gets returned.
You farted around too long for testing yours, so you might as well get another $15 one a immediately install and test while it's still returnable. (or catch your brother not looking and just change tillers with him. You said they look just alike.
I think I'm a carb repair guy can repair the big 4 barrel auto carbs, chainsaw carbs, small engine carbs but but them little bitty carbs can be a real pain. Zama finally woke up and no longer sell kits, just complete carbs. Most of the new carb problems we see are the China clones and not ever tested from the factory.