Going through the same thing with my Ryobi 2 cycle trimmer. Keeps flooding during use. Cleaned the carb and it looked fine. Went ahead and replaced the spark plug while I was at it. I’ve ordered a new gasket and diaphragm (about $5) and waiting on it to arrive.
Good luck and hope it works out. Not a great time of year to be struggling with your hand held power equipment!
I decided to replace both trimmer heads and ordered new trimmer line as well. Trying to be proactive and re-invest in wear items - which will hopefully translate into less issues on the job site!
