I bought a blaster that needed rebuilt and headlight/taillight and nuts and bolts here and there, this little switch was hanging. I don't have a clue what its for.
TORS switch. Smash it with a hammer and throw it in the trash. Then connect the 2 wires in the harness together. Save the rubber grommet. Put it back in the thumb throttle with a dab of silicone sealer in the hole.