Re: 1956 johnson 10hp qd17 low idle problems
You may be able to adjust the low speed mixture needle sometimes if it is way off you may need to remove the knob to turn it far enough to reach the correct setting.Initial setting is 1 1/8 turn out from gently bottomed.Then when warm adjust to the smoothest idle ending slightly toward rich.If the adjustment fails to correct the problem you may have to rebuild the carb with special attention to cleaning.