GRC: It sounds like rich jetting. I'm assuming that when you say "it's running rough...", you mean it doesn't idle well and tends to stall if you let it try to idle. Try this, warm up the engine for at least 15 minutes and run it through the gears a couple of times, then set the idle high with the idle adjusting knob. Now, turn your fuel screw very slowly out(counterclock wise) and see if the engines runs even rougher. If it does, you have been too rich on the pilot ciruit. If it DOES run rougher when going richer, start turning the screw in(clockwise) until the engine runs smoothest and at it's highest idle(don't touch the idle knob while doing this). You may have to go back and forth with the fuel screw slightly a few times to find that spot, but when you do, that will be the best mixture for the pilot circuit and may correct the problem. Hope that helps. If you can't get it corrected by doing this, you may have to change your pilot jet size. The proper way is to go to a larger(richer) jet first and see it that makes it worse. If it does, then you go one size smaller than the first pilot jet you started with. The aim here is to always end up with the richest jetting that your engine will run well with because too lean of a jetting will melt pistons.