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Hey guys I need some advice. I have a 1983 Evinrude commercial 40 HP tiller. It is a pull start two cylinder with one carb. Anyway it used to run fine, but at idle it would cough. So at idle I would pull the choke 1/10th out and it would smooth out. Anyway I ordered a carb kit and changed the float valve and seat, float, all gaskets. I soaked it and and cleaned it with carb cleaner. Now it will not idle without the choke on. I have played with the slow speed screw with no luck. As a last effort I opened it back up and put the old parts back in. If runs a little better but its not usable. It coughs and jumps and till it sputters to a stop. Any advice on why it will only run with choke half on at idle speed?