What parts do i need to build a dirt bike?
I have never heard of a dirt bike that comes in a kit form so this is out of the question. Engine, frame, swing arm, chain, sprockets, suspension, forks, handlebars, controls, wheels, spokes, tires, brakes, muffler, fuel tank, wiring harness, etc. In general, parts from different motorcycle manufacturers do not interchange. There are few universal fit parts. Even with the same manufacturer parts from different model bikes do not interchange. Many times parts from the same model bike but made in different model years won’t fit. So you are going to need to do LOTS of fabrication. I hope you are good with a welder, lathe, and milling machine. I hope you have access to a fabrication shop with these tools.