Go Cart 3D model is available on CGTrader for $19. Original author: ecati. Specs: 9868 polys, 14003 verts.
SKP (Sketchup, filesize: 3.15 MB), OBJ (OBJ, filesize: 1.05 MB), FBX (Autodesk FBX, filesize: 1.37 MB), 3DS (3D Studio, filesize: 810 KB), DAE (Collada, filesize: 805 KB)