This aftermarket TCI box from Yamaha is a legal and great alternative to the OEM TCI for KT100. It's marked as #4 on the diagram and is crafted by PRD.

To use this Yamaha aftermarket TCI box, simply install it according to the instructions that come with your KT100. Make sure to connect all the wires correctly to avoid any issues. When it comes to maintenance, keep it clean and dry. Check the connections regularly to ensure they are tight. If you notice any problems like the engine not starting properly, it might be a good idea to have it checked by a professional. Always follow the safety guidelines when handling electrical components.