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Right on lil'devil.
My race car (with a modded 5M) has a 0-2000 ohm potentiometer (variable resistor) in that circuit, placed over near where the light dimmer is. I turn the dial clockwise a bit to richen the mixture. Turn it all the way back counter clockwise to go back to stock. It seems to help gain power, as I dropped off about 2 tenths of a second at the dragstrip by using it to richen the mixture a bit once I got into second gear. If I richened it up in first gear it bogged a bit. Turning it all the way up to 2000 ohms was so rich that it even bogged on the highway in 5th gear. You'll need to play with the settings to see what works best for you.
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