I've got 2 running qt-50's - both yellow '82. The diff is that one sat out in the sun for 10-15 years, so that's the parts bike.
The better scooter was missing the speedo cable, so I pulled the one off the parts bike and hooked it up. Doesn't work going forward - but it DOES seem to register when the wheel is turned backward. Of course I pulled the cable out of the housing, used solvent to clean it well, and re-lubed with Phil tenacious oil, what I had on hand.
What's up with this? Can the little goodie that turns the speedo cable be stripped? Is there a way to test this? Common wear problem?
Any hints appreciated. It'd be novel to know how fast I'm going. ;-)