well, i got out to the shop today, and pulled off the "sprocket" steering system off of a Bean Cutler i got from Steve Johnson. this did not look correct to the machine, non the less, have i even seen anything like it on another one. as you can see in the pictures, it is a 2 piece design, and by my guess, looks like it has been modified to work somehow on the machine. there are grooves in the top plate, from the engine lift cable...this leads me to believe that someone machined off the old outer part of the pulley, and matched it to this "sprocket". i really dont understand why somebody would do this, as the steering wheel post is still set up for the original cable steer system.
the reason i know the "center hub" is from a cable steer system is because of the design of it.
here you can see that the design is the same for the center, as it is on an original cable steer pulley....note that the bolt holes for the engine lift cable guides, are straight across from each other, on centerline with the bore.
here, you can see that on the updated chain steer pulley, the design if the center, is different from the cable system...the bolt holes are offset from the center of the bore, and the "oval" depression is more "heart" shaped, than a perfect oval like the cable steer pulley depression has.
i am still not sure if this was some sort of factory modification, or a change made by somebody else....for reasons beyond me, seeing as it does not seem to have a way to work in combination with the correct cable steer hub on the steering wheel side of the machine. i hope that this will help get this figured out, and comments and suggestions are welcome...i am plain baffled on this one. this machine did not have an id tag on it either...its missing, so there is no way to know what year this one is unfortunately.