is it possible that a walbro cardb on my stihl fs74 line trimmer could be putting out too much fuel? I was using it and it just died, i tested the coil and it has spark, and removed air filter but all I could get it to do was pop for a few seconds. i pulled out the spark plug and it was wet so I tried it and retried. Again, just a couple of pops like it almost wants to run but cant. Pulled plug out and it was wet again, I pulled handle a couple of times without plug and almost could see a mist coming from spark plug hole! I turned down low adjustment screw but still wet plug. I took carb apart and didnt see any tears in the gaskets or diaphrams and needle looks ok. Anybody have problems with walbro wt 227 carbs? Im stumped here in central fl.