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If you just cut fuel going to the carburetor the carb still has fuel in the float bowl, enough to go maybe a quarter mile or more, then it will slowly lean out, at this point your engine is running really lean and this seems like a bad idea as an extremely lean burning engine tends to over heat the engine, this is why when honda started implementing this very idea in the mid 70's they put 4-5 solenoids on the carb, one on each supply to each jet, it added some complexity to the carb, but made the car use alot less gas.
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