Two or three things could cause this: The drive at your front wheel, the cable itself, or the speedo head. Lack of lubrication for the speedo cable is your prime suspect. The FSM does mention needing to "grease" the speedo cable and speedo drive, but I didn't see any details on that. Maybe a Google search on speedometer oil/oiling may help. I'll check my Haynes manual and update this posting.
Second would be the speedo itself. There is a spring and wheel system which translates the rotation of the cable into the swing of your speedo needle. Either the mechanism needs a little TLC (lubrication, adjustment) or there's something keeping the needle from swinging past your 80kph reading.
PS: Maybe your bike won't go any faster than 80KPH?
You have had a few problems with it lately... Just teasing you. I'm sure your bike is going faster than that, and there's a legitimate problem with your speedo.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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