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#1 Stoker

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  • Location:Stoke Gabriel, Devon

Posted 15 May 2018 - 09:17 PM

For various reasons yesterday was the first time I could take my 1970 CP for a serious run after the winter lay up.

After about 2 miles the rev counter started swinging wildly from side to side and eventually stopped working with the needle at zero.
But then suddenly after a further 20 miles it started working perfectly again and was still working today.

Was it just lack of use or do I need to investigate further or perhaps disconnect at the dissy end and put a few drops of oil in the cable?

Anybody got any idea as to what was going on?

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1970 TR6 CP BLA 106H

#2 Mike C

Mike C
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  • Location:Melbourne Australia

Posted 15 May 2018 - 10:36 PM

I swapped to a another  tacho as my old one started reading 50% high  after I lubricated it internally with lithium lubricant.


Try reversing the cable , my replacement tacho only worked when  the cable ends were reversed from the original installation.


I now lubricate the cable with moly grease but keep it a foot or so from the tacho connection - the cable lubricating procedure is in the BB.

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#3 elclem1

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Posted 16 May 2018 - 06:11 AM

Dodgy cable?
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#4 RogerH

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Posted 16 May 2018 - 07:33 AM

Hi John,

         it sounds like the cable.  If it was broken then it probably wouldn't restart and work OK.

Have a look at the square end of the cable at the gauge end and also the square hole in the gauge for signs of wear.

Quite often the cable grips just at the very end and eventually it rounds off.


Can the cable be inserted deeper.



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Time is a drug - Too much will kill you
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Veni Vidi Flati
TR4A - July 1967 daily driver         2010 RBRR No.22  2014 RBRR No.69
TR4 - March 1962 transforming like the proverbial caterpillar - it's now Royal Blue and now with the chromy bits.

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