T25 Sticking Speedo

[fixitsteve]

My speedometer has started sticking and showing the wrong speed or not working at all. Is this the cable or the speedometer itself. When i bang on the top of the housing it tries to free off. I was wondering if lubrication might fix it.

[MidLifeCrisis]

If it's sticking at a certain speed I'd suggest that it is the speedo rather than the cable.
The cable has to rotate at a set RPM to show a certain speed so its unlikely that the cable is incorrectly rotating at the wrong speed (cable problems usually show up as a bouncing needle)

[Oldiebut goodie]

I have just had this - mine was a broken cable, it was obviously catching on the broken wires sometimes and would work, a tap would fix it when it wasn't working until one day I decided to check it and found 13 inches of cable inside the outer that was making intermittent contact with the remainder. New cable sorted it.

Yours does sound more like it is the speedo display itself though but I would check the whole cable setup first from the square hole in the cap on the wheel to the binnacle. I just pulled the cable out from the binnacle end - it shouldn't do that!