electronic ign

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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electronic ign

Postby poptsova » Thu Sep 10, 2015 7:23 pm

Hello has anyone fitted electronic ignition to a g12 in the distributor thats a 18d2 lucas if so what make and was it a success thanks for any help.

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Re: electronic ign

Postby robcurrie » Thu Sep 10, 2015 7:50 pm

I have fitted a Thorspark in the magneto of my 31 CSR, they do make a unit to fit your distributor. It works very well, but they should have put Loctite on the screws which hold the pickup onto its baseplate.

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Re: electronic ign

Postby Reynard24 » Thu Sep 10, 2015 8:03 pm

I fitted a Powerspark ignition kit to my G15/45 18D2 dizzy.This replaces the points and condenser but you'll need to check the A/R bob weights etc are ok. In my case it was money well spent, so much so that I've ordered a second kit for my brother's G15/45.

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Re: electronic ign

Postby Les P H » Thu Sep 10, 2015 10:14 pm

Could you not use any electronic ignition unit suitable for a twin? The new system will drive twin sets of coils...one per cylinder. This way you won't need the rotor arm to distribute the spark to each cylinder so you won't have any HT leads going in or out of the cap thus cutting out a potential leakage spot for the sparks. You can use black mastic to fill the empty holes...... The sensor switch fits in the distributer...then the remote ignition box feeds twin coils conveniently sited to drive short HT leads to each plug...The A&R bob weight unit is usually removed to take the new sensor disc....Les

PS....There are ignition units that still use the original points and bob weight advance and retard unit and drive one coil so the whole system virtually remains the same HT cable wise driving the rotor arm as before...The advantage of this type is that the spark power is boosted and the points don't arc so last longer and they are cheaper..

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Re: electronic ign

Postby poptsova » Sat Sep 12, 2015 7:24 am

Thanks now have spoke to thorspark and they say they do a system for the 18d2 so have ordered one lets see what happens thanks to everyone for you input.

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Re: electronic ign

Postby robcurrie » Sat Sep 12, 2015 5:12 pm

David, here is a link where you will see my method for setting the timing with a strobe light. I ran the engine with the primary cover off.

http://www.jampot.com/forum/viewtopic.php?f=12&t=12940&p=117818&hilit=thorspark&sid=57f4e2c434e911afcce169e6bc669982#p117818

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Re: electronic ign

Postby poptsova » Sun Sep 13, 2015 5:24 pm

Thanks rob i will do something similar for strobe timing .

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Re: electronic ign

Postby bjork » Sun Sep 13, 2015 7:15 pm

When i looked at the same job, the usual Boyer/Pazon back plates were all too large a diameter for the 18D distributor. I think Al Osborne did a modded kit to fit them. Luckily for me I was able to tweak the advance retard unit to a usable state and use a twin coil, thanks to advice on here. If the thorspark still uses the original advance retard kit that may be your biggest challenge to get it running right.
Using yesterdays technology to create tomorrows problems today

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Re: electronic ign

Postby trophy » Tue Sep 15, 2015 6:58 pm

Reynard24 wrote:I fitted a Powerspark ignition kit to my G15/45 18D2 dizzy.This replaces the points and condenser but you'll need to check the A/R bob weights etc are ok. In my case it was money well spent, so much so that I've ordered a second kit for my brother's G15/45.


I also fitted a Powerspark unit to my 1962 Model31 with 100% success. Would recommend them to anyone as a replacement to points. Important to get the timing right, preferably using a strobe with the outer chaincase cover removed.
Ride safe all.

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Re: electronic ign

Postby McBob » Wed Sep 16, 2015 10:38 am

Fitted one of the power spark/simonbbc kits to my triumph spitfire, for 20 quid why not?

Thankfully I also kept the points and condenser in my tool kit, as these got me home when red module failed less than a month later.

On the classic car forums there are many same such stories, although some folks exceed a year before trouble.

The car is now back on quality points etc and my dyno trousers tell me it goes much harder, certainly revs better in upper range.

my 10¢ worth

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