My 87 RTR has a 2 piece speedo cable set-up. Speedo gauge started acting up (wouldn't roll the miles over just would "click"). Took it apart numerous times and rebuild (unsuccesfully).
Bit the bullet and bought a new speedo with the cables (2) and the right angle drive gear thingy. Now she works. FYI - even with 140K, the cables and right angle gear thingy were not in that bad of condition, but now I have a working speedo and piece of mind.
Now I gotta sell her, too many toys in the garage.
fergy