Ive just bought a yamaha dt 125r sm as a little project, its previously had both top and bottom end rebuilds. The previous owner admitted he spanked it everywhere and has cooked the engine. The bore is fine as is the piston, theres alot of oil in the radiator but the thing thats confused me is it seems theres 4 stroke in the head, any ideas?

My idea is not to post workshop questions in the bar area.