I bought a new Nashbar 6-speed freewheel for my 82 Cilo (Maillard hubs). I have also aquired an 81 Miyata, which has Suntour components and a teensy little 12-22 freewheel. (I am 200 pounds, and with a 52/42 crank, that ain't gonna cut it)
Will the new freewheel work on the Suntour hub? I seem to recall reading something about Suntour not following industry standards, but I don't know when that took place.
Most likely I'll have to replace the rear DR as well, the Suntour Superbe is a pretty piece, but has a listed capacity of 24 T.