My first bike was a twin port Jawa 250 (Road bike). It was very similar to that with the square section frame and the same hubs, but had 16" wheels. Had a little hat that used to go over the carby to make the engine very streamlined looking. Flogged the poor thing round for years till I got a 350 twin Jawa. The combined gearlever/kickstart was a bewdy. Had to rebuild the clutch and did the boiled up corks routine and sanding off. It had done a gazzillion miles before I got it, can't remeber what happened to it.