How to Install a Motorcycle Kill Switch | DoItYourself A motorcycle kill switch is used either to maintain or disable the connection to the ignition circuit. The purpose of a motorcycle kill switch is to prevent theft of the bike. A side benefit is that a motorcycle kill switch may lower your insurance. This type of device is not overly difficult toAuthor: DIY Staff Motorcycle Kill Switch | eBay This will also fit monkey bikes that use the Honda C50 engine in a 90cc 110cc 120cc 125cc form. The kit includes a Wiring Loom, Coil, CDI, Spark Plug, Kill Switch.