Thanks for that tip
Originally Posted by lawnmaniac883
Just take the air filter off of the carb you suspect is bad and once you get the engine running, put a gassy rag next to / over the carb opening and as you increase the throttle, hold the rag closer. The vapors from the rag act like a crude carburetor but will run the engine just fine if carb is the problem. Taking new carbs off of new trimmers to fit onto an old blower just for a check is a waste of time. Rag works every time.
......the problem turned out to be a spec of dirt in the tiny jet valve. I failed to pull it out and run fine wire through it when I rebuilt the carb. I thought I sprayed carb cleaner through it put obviously didn't. Put it back together and it is running fine.