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I can't vouch for all or even most, but I've never seen a shut-off solenoid in a carb. I've worked on hundreds if not thousands of cars, trucks, and non-road use equipment both professionally( 25+ years) and personally( a bit longer). Adding one would help with engine braking, but carb bowls do hold enough fuel to build up in the exhaust and ignite when ignition is returned. And yes I have experience this first hand.
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