The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: Triton Thrasher on 03.05. 2009 10:31

Title: Loose points pivot post
Post by: Triton Thrasher on 03.05. 2009 10:31

Does this happen to anyone else?  Three times I've had points pivots come loose, closing up the points gap, on steel K2F backplates. 

Are there good and bad backplates on the market, or only bad?

Title: Re: Loose points pivot post
Post by: dpaddock on 07.05. 2009 23:20

I suspect these are aftermarket plates.
You could braze the pin or, conversely, get a Lucas original from Mitch Klempf.
David

Title: Re: Loose points pivot post
Post by: Triton Thrasher on 08.05. 2009 09:11

Thanks- he stocks a lot of stuff there! The post looks like brass, so maybe soldering is a better option than brazing.

Title: Re: Loose points pivot post
Post by: MikeN on 08.05. 2009 12:33

I dont think you should soft solder. Its not going to be very strong.
You could use silver solder.Brass silver solders very easily.
Easy flo no. 2  .Melting range 608-617 deg C. Brass melts at 850 deg C.
Or buy a new one.
Mike

Title: Re: Loose points pivot post
Post by: Triton Thrasher on 08.05. 2009 15:09

I don't grudge £30 for a new one. I wouldn't be so happy about 10 new ones for £300 going loose in quick succession though!

Silver solder option sounds worth a try.

Title: Re: Loose points pivot post
Post by: Triton Thrasher on 10.05. 2009 11:09

Practicing on one that went loose before, I dribbled some plumbers' solder into the joint and it seems good.  Its pivot post is a strange copper-coloured metal. Maybe it's copper.  The newer one that's on the bike is brass.

What are those toothed washers called? the ones that hold the moving point on to the post on a steel backplate? Are they available elsewhere than singly in sets of points?

Title: Re: Loose points pivot post
Post by: fido on 10.05. 2009 13:08

They are called Starlock washers:

http://cgi.ebay.co.uk/4mm-Starlock-Washer-Uncapped-6492-x-15_W0QQitemZ300309615471QQcmdZViewItemQQptZUK_DIY_Material_Nails_Fixing_MJ?hash=item300309615471

Title: Re: Loose points pivot post
Post by: Triton Thrasher on 10.05. 2009 16:02

Quote from: fido on 10.05. 2009 13:08

They are called Starlock washers:

Sounds like a BSA invention.  Ta.