I bought a used engine not long ago for $50. What are the most valuable and hard to find parts are the fuel tank and plastic covers. For $50 mine didnt have em. I scrounged them later from various places for another $75. Cleaned and ringed the engine, rings looked ok, but why not when its apart. Total cost less than $200. Only thing not there versus a kit were the controls and mounting clamps which are not big deal or $ to come up with( I didnt need em as its going on a Velosolex). Moral of the story is fror some scrounging effort, you can come up with an original Solex which is so much better made for about the same money. I still have 2 HD/Solexes which are good runners once sorted out, and I would probably pay $200 for another, but you can with some searching get an original.