Both my speedo and tach are reluctant to go over a certain reading - 60mph for the speed and 6000rpm on the tach. I've changed both cables, to no avail. Occasionally the speedo has shot up from 60 to 80-90, then back again.
My hypothesis is this:- 38 year old bike, original clocks, there has to be some wear in the square socket where the cables go. When that wear gets bad enough, the cable end starts to slip, resulting in the instrument not responding to increased cable speed. This accelerates the wear further.
Solution:- can't see a way of closing up the hole in the clock, so building up the cable end, maybe in a tapered way, to provide a snug fit, would do it. So I tried solder (after cleaning the cable end), then filing down to a good shape. This seems to have helped the tach - ran it on a drill up to 10000 - but just can't get the speedo cable to accept the solder (I'm a rubbish solder merchant, by the way).
Wonder if anyone else has found and solved this problem in a different way?
BTW mine's a CB500, 1975, but I guess the issue would be the same for for all models of that era.
Cheers,
Rog
UK
