Rear Brake drum

Information relating to the Matchless G12 or AJS Model 31 650cc twin
Posts: 57
Joined: Mon Dec 19, 2016 11:42 pm

Re: Rear Brake drum

Postby BruceB » Mon Oct 14, 2019 5:41 pm

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 :rofl:


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! :D
1959 G12
1977 Yamaha XS750 Triple
1998 Suzuki Bandit GSF600S
just don't me started on cars on top of this!

Posts: 199
Joined: Sat Jan 14, 2017 11:48 am

Re: Rear Brake drum

Postby bob121 » Mon Oct 14, 2019 8:25 pm

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


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