Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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If you can get to the back of the switch just unplug the wire(s) that are attached there. This will allow you to operate the machine without a key, just keep in mind that you have no way of shutting it off with this unplugged. If you by chance have a riding mower you can try the key from it as most of them will work. It is not a really special key, somewhat universal in a since.