Camp6 said:
My main concern at this point is when I look into the exhaust port. The inner area appears to be severely rusted and almost looks fused. The right side port is worse than the left and has a white"ish" powder.
Why are you concerned about rust and corrosion? These engines will need to be completely torn down and rebuilt. Looking at the pictures, they all look like they were open to the elements, either missing rocker covers, carbs or pipes. Can't tell if the plugs were out. No matter, if any moisture got in there, they will need to be torn down. You can try and get them running like this, but likely will cause more damage even if you can get any of them started.
In reading this thread it really seems that you do not know what this will take to get even one of these bikes in drivable shape let alone restored (still can't tell what your plan is here...drivers or restored).
Very confusing, like you think you can put pieces from the bikes together and get one done...but all the pieces need work.
Those of us that have restored bikes (and classic cars) understand that you need to start by choosing one of the bikes and tear it down and figure out what it needs. On these the first place I would start is by pulling the engine and tranny and tearing them down...you have no idea of condition on any of the internals.
Sorry if I sound a little pointed, but like many of us have said in this thread and the earlier thread...you have your work cut out for you and will spend 3 times what you think right now to get even one of these bikes running and street safe.