The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: Will on 28.05. 2020 15:57

Title: Mag buggered
Post by: Will on 28.05. 2020 15:57
My mag is buggered On my a10 I’m borrowing a friends at minute apart getting it refurbished what’s my options My advance and retard is pretty worn as well , if I go electronic is there a big advantage would I have to fit ignition etc up grade battery I’m on 6 volts 👍
Title: Re: Mag buggered
Post by: muskrat on 28.05. 2020 21:12
G'day Will.
There a couple of forum members that rebuild magy's. beezermacc and groily. Stick with the magy if you can.
I have electricery on both mine. Converted to 12volt but you must have a good working dynamo. No battery power = no go.
Cheers
Title: Re: Mag buggered
Post by: KiwiGF on 28.05. 2020 21:51
My mag is buggered On my a10 I’m borrowing a friends at minute apart getting it refurbished what’s my options My advance and retard is pretty worn as well , if I go electronic is there a big advantage would I have to fit ignition etc up grade battery I’m on 6 volts 👍

I’ve been running a bth electronic mag for since 2012 ish, no reliability problems so far, i think the design by BTH has been improved since I bought mine. They are expensive! I doubt they are “roadside” fixable, except if you carry a spare coil around (I must get one come to think of it!)
https://www.bt-h.biz/K2F--Lucas-Replica-Flange-Magneto
There are quite a few good options on what to fit, I just didn’t want to have the hassle of periodically setting points gaps and timing etc on the std mag.

I have a (newly rewound) std mag fitted to my B31 and that has caused several breakdowns, but to be fair its always got me home (eventually). Issues have been points closing due to screws working loose, broken points spring, “dirty” points, rain getting in and preventing it starting (this last issue does not seem to be common with A10’s tho).

Edit: there are quite a few threads on this topic.

Title: Re: Mag buggered
Post by: Will on 28.05. 2020 21:53
G'day Will.
There a couple of forum members that rebuild magy's. beezermacc and groily. Stick with the magy if you can.
I have electricery on both mine. Converted to 12volt but you must have a good working dynamo. No battery power = no go.
Cheers

I have just rebuilt engine fitted a belt drive and refurbished dynamo so all good there I would like to stay with mag
Title: Re: Mag buggered
Post by: groily on 29.05. 2020 05:21
With all these things, there's 'buggered' and there's 'buggered', with much depending on the degree of embuggerment.  Disembuggerment of the mag and retention of 6v electrics is probably lower cost than a replacement ignition system, 12v battery, regulator, bulbs etc, and should be properly reliable too. So I think your instinct to stick with it is good. (I am, of course, biased.) But there are loads of options and you probably still need to do some www homework to be sure what will suit you best. There are advocates for all options on here and plenty of real-life experience of how they pan out in practice.
Title: Re: Mag buggered
Post by: Will on 29.05. 2020 08:42
With all these things, there's 'buggered' and there's 'buggered', with much depending on the degree of embuggerment.  Disembuggerment of the mag and retention of 6v electrics is probably lower cost than a replacement ignition system, 12v battery, regulator, bulbs etc, and should be properly reliable too. So I think your instinct to stick with it is good. (I am, of course, biased.) But there are loads of options and you probably still need to do some www homework to be sure what will suit you best. There are advocates for all options on here and plenty of real-life experience of how they pan out in practice.

Thanks groily it is indeed buggered and I would like to debugger it the degree of debuggerment is yet to be established  *smile* it cuts out when warm and doesn’t restart for about 5 mins , I would like to keep it as is I have enough hassle with my more modern bikes keeping battery on tenders etc   *smile*
Title: Re: Mag buggered
Post by: Sav on 29.05. 2020 08:53
With all these things, there's 'buggered' and there's 'buggered', with much depending on the degree of embuggerment.  Disembuggerment of the mag and retention of 6v electrics is probably lower cost than a replacement ignition system, 12v battery, regulator, bulbs etc, and should be properly reliable too. So I think your instinct to stick with it is good. (I am, of course, biased.) But there are loads of options and you probably still need to do some www homework to be sure what will suit you best. There are advocates for all options on here and plenty of real-life experience of how they pan out in practice.

With the 6v LED bulbs now available, personally, I think the incentive to go to 12v has gone. If it don't itch don't scratch it!

Chez Beezermac for the mag.
Title: Re: Mag buggered
Post by: beezermacc on 29.05. 2020 09:00
One of the problems is knowing whether or not it is your mag that is buggered. As has been said before, 'most carburettor problems turn out to be electrical (magneto in our case)'! The obvious thing to do is to try a known good mag as a substitute and quite a few of us probably have a rebuilt mag in the airing cupboard 'just in case'. I am happy to loan out K2F's to anybody who wants one. Send me a p.m. or give me a ring.
Title: Re: Mag buggered
Post by: Swarfcut on 29.05. 2020 09:10
 Will. 
      That maggy can't be considered on its last legs. I thought it had the electrical equivalent of a rod through the crankcase. It is in fact a runner, with a very common problem, easy to remedy.

     These days, thanks to a  clever  innovative solution, your maggy can be returned to good reliable working order at far less cost than almost any other option.

     More information elsewhere on the forum, so to endorse groily, time for a bit of homework to establish the cause of the hot failure from the symptoms shown and the straightforward fix.

 Swarfy.
Title: Re: Mag buggered
Post by: Will on 29.05. 2020 09:18
I have fitted new carb during rebuild I have 6v bulbs , and I am using a friends mag to run it in , it’s going well I have a slight leak from under primary side somewhere not enough to worry about when I have done 500 miles I will change oil and filter etc (I have a remote filter in tool box) Retoque head and do tappets and have a look  *smile*