KEYED IGNITION SWITCH ,usually has two circuits, engine on/off and 12v on / off, this circuit is fuse protected ( lights, horn, electric starter, horn ect.)  if  any bulb to light up consider the 12v circuit of the switch OK . ON/ OFF circuit can be tested for continuity, try to find an schematic , this circuit will not read 12v.
ON/ OFF SWITCH  (Not keyed) ON/ OFF switch can be tested for continuity.
BRAKE / CLUTCH  HANDLE SWITCH if you see an electric wire attached to this device it could be a CDI disable, coil ground, electric starter disable.
You may need to engage the handle to get fire to the plug. Continuity test the suspect handle.
EMERGENCY TOGGLE CUT-OFF This device must be locked center. Continuity test the suspect switch.
SAFETY PULL-AWAY SWITCH This device is a key, connector or plug that can be attached to the rider.

PRESSURE SENSOR SWITCH , Oil pressure, kickstand, seat lock, these are the hardest to diagnose, if suspect bypass and test system.

A switch only completes or breaks a circuit. Inspect the switch before bypassing to determine the function.