I've got an old Toro S200, with a Tecumseh 2 stroke that I'm having some issues with. Not the one in my other thread, that one's running fine. No, this one has fixed jets on it, so the adjustments are very limited. I've taken the diaphragm off and shot carb cleaner through it as well as I can, and let it sit. In fact, I've done this about three different times. I blew air through the openings I could see, and reassembled it. I replaced the diaphragm and gasket with a new one. The gas is flowing nicely. It starts fine, and after a pretty short warm up will run just good at half choke. However, when I try to open the choke all the way, it starts to hunt for an idle, and if left to go, it will eventually die. I've tried increasing, and decreasing the tension on the governor spring, also tried screwing the idle adjusting screw in and out. No mater what I've tried, it still hunts and will not run properly with the choke off, but runs O.K. at half choke. The plug was actually a nice brown color when I took it out after running it for a while at half choke. Is there any thing I can do with this carb with the fixed jets, or should I not worry about it and run it at half choke all the time?