BSA C10 C11 C12

Old MSN Group Messages => Old MSN Messages => Topic started by: AdminPete on November 25, 2008, 05:53:43 PM

Title: Warning C12/C11G condenser
Post by: AdminPete on November 25, 2008, 05:53:43 PM
I have noticed, as I won but thankfully did not pay for, a C12/C11G condenser on e-bay. It is listed as a replacement for a Lucas 423871 which is in fact the part for a mini. The correct condenser for a C12 is a Lucas 420302. The seller has another advert in for another "C12" condenser and I have asked her to change the advert. But I thought it worthwhile warning you all so no one else makes the same mistake mistake.

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From: Mentalmanicmike1 Sent: 17/10/2006 19:00
I now notice that Rectory Antiques are also selling on e-bay a condenser for an C12 which is a 423871 which is for a mini. Does anyone have an equivalents table for Lucas Condensers? There is of course the possibility that the Lucas 420302 is no longer made and the 423871 ids the nearest and will work. Any thoughts on this would be helpful.
Best regards

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From: Setsquared Sent: 22/10/2006 12:25
Well FWIW I use either a mini or ford escort condenser on all my brit bikes
They work fine, also even if you do find an original they are going to be 20+ years old and probably dried up and useless.


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From: PeteRudge1 Sent: 22/10/2006 13:41
I could be wrong, but I'm sure I was told once by a Halfords blokie that all condensers are the same inside, only the cases and fixings change. BUT, as I say, I could be wrong. It would be interesting to hear the facts from an auto electrician.


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From: Setsquared Sent: 23/10/2006 22:28
That’s more or less true they mostly range from 0.5uF to 0.75uF
On an old coil ign engine this will make little difference
The BIG difference is the price, N.O.S. are vastly overpriced, NEW mini/ford condensers cost under 3 UKP


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From: steveOh420 Sent: 26/10/2006 01:32
Condensors are basically the same inside, however the length of the wire and cylinder determines the  suppression time of the "spike" of power in the primary circuit. Condensors are also used to suppress electrical interference from alternators on cars as well, called noise suppressors, as they "absorb" extra current flow through the (-) or earth. The key is ohms of resistance.

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From: Setsquared Sent: 26/10/2006 18:29
I don’t wish to start an argument
But you are completely wrong with that idea
It is the capacitance expressed in microfarads uF which is the determining factor
A condenser is after all, a capacitor in another name


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From: WODENTHEGOOD Sent: 26/10/2006 19:39
I didn't expect to generate such interest when I asked this question - but no knowledge is wasted and all opinions should be questioned. I agree with you Setquared about the capacitance being measured in Farads (named after Faraday). I seem to remember that cheap low power capacitors are just a metal foil sandwiched between a coated paper and wound in a cylinder - so should they not last almost forever? By the way I sometimes seem to appear as my son, MentalMike and sometimes as myself Woden ( the Norse God of War that I had written on my crash hat in my Rocker days, 40 odd years ago).
Pete I must say that this is the very best website that you have started. You should be congratulated.
Regards to you all, John (Woden)

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From: PeteRudge1 Sent: 27/10/2006 18:12
Thanks for the kind comments John, but remember this site wouldn't be what it is without the members contributions. Thank you all for your support.
Title: Re: Warning C12/C11G condenser
Post by: Biker Gaz on July 02, 2015, 04:42:55 PM
I should have read these messages first, but i fitted a 423871 to my C12 and it all works fine.
Title: Re: Warning C12/C11G condenser
Post by: hampshirebiker on July 03, 2015, 10:01:45 AM
I think a condenser is pretty much a condenser. Also don't forget that it can also be fitted by the coil or remotely. It doesn't have to go by the points; providing it is wired in correctly.
Title: Re: Warning C12/C11G condenser
Post by: Paul S on July 03, 2015, 10:43:09 AM
For a capacitor to do the job it needs to be the correct capacitance (microfarads) normally printed on the caseing as a number followed by uF.

Also a voltage is normally printed.

As long as it is physically possible to fit it and you don't exceed the stated voltage (unlikely on a motorcycle) and the uF is correct it should work fine.
Title: Re: Warning C12/C11G condenser
Post by: hampshirebiker on July 03, 2015, 10:50:27 AM
Thanks Paul, my take on these things is always a bit simplistic.
Title: Re: Warning C12/C11G condenser
Post by: donkey on November 03, 2015, 08:08:54 PM
I couldn't start my c12 one day so after checking things out it was the condenser at fault as I did not have a proper one I fitted a Suzuki gt380 one I had sitting in a toolbox works perfect
Title: Re: Warning C12/C11G condenser
Post by: Steve McCarthy on October 02, 2017, 06:10:02 PM
Just to add my tuppance worth; years ago when electronic ignition was a thing of the future, I used to fit any capacitor that was roughly the same rating (uF), voltage if applicable and would fit the position, adjusted as necessary. Datsun/Nissan cherry ones worked on allsorts and were a fraction of the cost of the genuine Japanese ones.

I discovered you could do this at Merton whilst studying motorcycle mechanics. Saved a lot as I was buying, selling and servicing bikes. People appreciated the savings.

Call them what you like but they are just a metal can with foil, paper and acidic goo in them with a wire attached. I'm sure these days they are working on something a lot more complicated to replace them and thus charge you more money.
Title: Re: Warning C12/C11G condenser
Post by: Tman on October 02, 2017, 06:41:37 PM
Use any ignition system capacitor that'll either fit in the space or be mounted somewhere convenient, but steer well clear of anything described as NOS as caps deteriorate whether used or not; something from the days of BMC or Rootes isn't to be trusted... :-\