Tank 150 starting issues

[portero72]

Howdy all. The gf has a Tank Urban Classic 150 that sat unused for a year or more(and whose reliability was suspect prior to that). Dove into the carb, thinking it needed cleaning, which it did, but still would not start. Replaced the carb with a new one, fired right up and ran for a cpl weeks, then returned to cranking but not running. On a whim, I bought ANOTHER carb and swapped it. After a bit of cranking, it fired up and ran great for about 2 rides. Now it is back to cranking but not turning over. I have confirmed spark is good and fuel is flowing. So, TWICE it has responded temporarily to a new carb, only to die within a few rides. Any pointers on where to look to get this heap running?