NO2C Clone is an open-source Speeduino engine management ECU PCB designed for DIY automotive and motorcycle engine management applications. The board provides the electronic interface and control circuitry required to work with the Speeduino platform, including ignition and engine-control functions. This project is intended for builders who want to manufacture their own NO2C PCB and assemble it using through-hole electronic components. The project files include the PCB manufacturing files and a bill of materials (BOM) to assist with component sourcing and assembly. The PCB is designed as a clone of the existing Speeduino NO2C design and is shared for educational, development, repair and DIY engine-management purposes. Users should verify the PCB files, component values, footprints and wiring before assembly and installation on an engine. PCB design files were prepared using KiCad 9.0.