I believe that is something to do with racing. It would be rather dangerous if the card "fell" out for some reason and the motor died (everything that can fall off should be lock-wired to prevent it from doing so!), so I think the idea is to initiate the ignition with the required card, and then pull it when you set off.

If you had an off mid race, the fact it will re-start without the card suddenly makes sense, does it not?
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Andy.
NSR-WORLD.COM

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