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Terry,OH · 09-23-2021, 06:33 AM

Are you able to idle at about 500 RPM? If so adjust idle mixture screws there. Check vacuum, adjust mixture for the highest vacuum. Even at 500 the throttle plates will be open slightly. When the throttle is moved off idle the accelerator pump has to move or you will have the problem you are experancing. The S setting is supposed to be leaner than the W. As mentioned previously the main jet size of an original single 97 on a flathead is .045" and the power valve #65=.035" I see no reason why your engine, if 85-90HP, should run better with smaller mains. Have you checked the power valve size? The float level and the fuel pump pressure 2 to 2.5

09-23-2021, 06:33 AM	#25
Terry,OH Senior Member Join Date: May 2010 Posts: 4,751	Re: Stromberg 97 adjust Are you able to idle at about 500 RPM? If so adjust idle mixture screws there. Check vacuum, adjust mixture for the highest vacuum. Even at 500 the throttle plates will be open slightly. When the throttle is moved off idle the accelerator pump has to move or you will have the problem you are experancing. The S setting is supposed to be leaner than the W. As mentioned previously the main jet size of an original single 97 on a flathead is .045" and the power valve #65=.035" I see no reason why your engine, if 85-90HP, should run better with smaller mains. Have you checked the power valve size? The float level and the fuel pump pressure 2 to 2.5 Last edited by Terry,OH; 09-23-2021 at 06:40 AM.