The kill switches I've seen have one side of the switch grounded, and the other side connected to the coil input wire from the ignition stator. Unless you're using an aftermarket coil there should be another connector at the coil input for the kill switch wire, as all my Hondas have them.
Grounding the kill switch to non-rubber-mounted bars will probably work fine, but I'd prefer running a separate wire to the coil ground.
Ray
_________________ '74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric
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