Throttle safety switch.
Its not an M8 but my buddies m7 melted the throttle cable and when he went to take off the throttle stuck wide open flipped him right off, but the tss kill the sled instantly, its there for a reason. If you are just wondering so incase of a malfuction, when my 900 was acting up (I think my throttle cable was out of adjustment) I just unplugged the throttle position sensor down by the carbs and rode out, it lost all timing advance but I made it out. I don't know if efi will work the same way.
I wouldn't recomend unplugging the TPS. After working on carbs and reinstalling them at about 1 AM I forgot to plug it in and only got about three miles the next day before frying both pistons. I know it is supposed to retard the timing to a safe area but something sure cooked my engine. And no, I didn't cold seize it, was good and warmed up.
The middle wire is the one to cut on the 06 and previous carb sleds at least and your kill switch still works. I have had several safety switches get water in them and refuse to work right no matter what else you do. Cutting the wire was the only way to get the sled to run without a whole new switch assembly.