6H4-85540-21-00 CDI (ECU) Unit Assy For YAMAHA 2T 3Cly 40-50HP Outboard Motor

  

Others have different holes and different internals, so you will get an error when you install it. Middle wiring: Ours is the same as the original one, because some machines have different installation methods. If there is no response, change the position and reconnect it.