AJS & Matchless Owners Club

Group Leader wrote:

bob121 wrote:
The thing that amazes me about the Chronometric speedo is just how robust these apparently delicate, precision clock movements are given the environment they work in on our motorcycles, highlighted by the fact that they have done so for decades. They appear to be extremely accurate too - I like to check the calibration as I pass each radar speed sign of which there are many these days

Alan

Mine was very jumpy so I bit the bullet and took it apart and cleaned it. There are amazing little bits of kit and have lots of small parts. However with a bit of care and good eyesight it is fairly easy to work out how it works and clean it up, generally and amazingly this is generally all they need.
It seems that oil being transmitted up the drive cable is the usual culprit, contaminating the mech and stopping it reading correctly.

and yes, mine now works fine, I did manage to put it all back together correctly!

This is sorted for the most part. There were several issues and the last being the drum does need skimming.