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Adding a shut off flap to the air intake is a much better option than relying on a CO2 extinguisher. It will be faster acting, and you won't have to rely on aiming the extinguisher, or being close enough. Many older fire trucks had that feature, with a cable control at the dash by the steering wheel. All you had to do was pull the handle and it caused a flap to shut off the air intake. It's also cheaper and more reliable.I wanted to bring this back up. I need to get an extinguisher for my Deuce. I didn't see anything mentioned about using one for a run away engine. I was considering a CO2 extinguisher thinking (in theory) it could be used to stop a run away without destroying the engine. Opinions?