SOHC.co.uk Forums > CB350/400

Tacho Full of Treacle

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Chris400F:
My 400/4 had not had much use for a long while before I bought it.
Have got it running but tacho behaves as if it is full of treacle - very sluggish in movement.
I'm guessing whatever lubricant is in it may have hardened with age and/or lack of use.
Any thoughts as to whether this may improve with use or anything I could do to improve the situation.
Alternatively if a refurb may be necessary any suggestions for someone to do it who wouldn't charge the earth.
Thanks.
Chris

hairygit:
Try a new genuine tacho cable first of all, and make sure it is routed properly and not kinked. If that gives no improvement then the problem is most likely in the tacho itself, but fitting a new cable may well sort it.

Chris400F:
Thanks for the suggestion.
Cable has already been replaced so it isn't that.
Symptoms are the same when spinning the tacho with an electric drill (running in reverse as that's the direction the cable turns) so problem is with tacho.
I read of someone who dismantled a tacho and cleaned the workings with alcohol. Might give that a try, a new skill to learn.
C

Bodd:
I wouldn't pay someone to do it, they are easy enough to get apart but if you do clean it with alcohol and get all the old lubricant off what are you going to use as a lubricant ?

I took mine apart when I made some new dials, if you look on this page of my log about 1/4 down the page you will see how I got the clocks apart.

Chris400F:
Clocks look good in white. I'm guessing the tacho is off something like a G5 with the idiot lights and 9200 red line (400 is at 10000).
No idea what lubricant to use, maybe a light machine oil but sparingly.
Not even sure what alcohol, haven't really looked at what is available yet.
C

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