Well I picked up the trimmer yesterday and started it. I primed it 10 times and then it took 6 pulls to get it started. After revving it up it does idle down, although slowly. It also is pretty cold blooded, it'll stall if I don't give it about 2 minutes to warm up. It will still bog down & stall if I have the powerhead turned on its left side facing down, although this does make the fuel feed line go to the top of the tank, lol. Also, it revs up like this when I give it full throttle off idle: the powerhead shakes pretty hard off idle then revs up in a slowish manner, nothing like what I'm used to with 2 cycles, do you think there's still a problem? It's even slower to rev up with the brushcutter attachment, although it is heavier to spin the blade vs. the trimmer head. It doesn't smoke except I did notice a bit of blackish puffing when gassing it off idle when it was cold. I used 40:1 fuel (87 octane) to oil. The Sears service center in Melrose Park, IL just adjusted the carb and "fixed" the fuel cap. I can't test it out under load as all I have to work with is snow, lol. It is cold out (27*), do you think this would make it run like it's too lean yet? What do you think?