Normally, it can be done by closing the throttle plate or closing another plate downstream towards the engine. And oftentimes, you just have to reconnect the cable without intervening linkage. This happen when the throttle cable from the gas pedal sends a "request" to a spring-loaded linkage that it counteracted by the fan-driven governor.
If there is a governor plate downstream between carb and engine, remove it and its shaft, and plug the shaft holes with screws.
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