I used reverse engineering and remade the whole thing to be able to publish drawing. i made some modifications like the holes in the engine block and changed three parts to be able to have bearings on the crank shaft. The steps files are available to allow you to make changes and experiment a little bit more.
Maker MoM who loves to build things and understand how they work. Gadget enthusiast. Colombian 🇨🇴. Living in Sweden 😜 3D print Technician 👩🏽🎓