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Coils #798280 02/14/20 7:49 am
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gollywog Offline OP
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Hi I have put a sidecar on my 1968 Lightning and want to change to a single carb head. I want to keep the lightning side covers but am struggling to fit coils. Any suggestions? How about the Trispark 12v duel output coil for instance?


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Re: Coils [Re: gollywog] #798283 02/14/20 8:40 am
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Allan Gill Offline
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Hi, how are your coils fitted now? In 67 they had the one coil in its side and one upright behind the panel. By 68 they changed to having a different side panel cross bracket and the coils were mounted off the top engine mount rear bolt. From 68 through 70 the parts book shows both types. Although the early type shown as for lightning was no longer used. The type shown as for thunderbolt was used right through (from 68) on all variants.

I’ve pinched this photo from an older thread but it should give you the idea

[Linked Image from i266.photobucket.com]


beerchug
Re: Coils [Re: gollywog] #798284 02/14/20 9:01 am
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gollywog Offline OP
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Thanks Allan. That's interesting about one being on it's side. Mine were fitted close side by side as per usual 68 twin carb spec. Anyhow, I just ordered the tri spark twin lead coil which should take up less space and does away with the bothersome HT lead coil clip and plastic cover that always seam to come loose at awkward times. Thought there would be more space with one carb, but with the air filter stuck on the back it's fairly tight. Will have to move my Pazon points box too. I do prefer the look of the Lightning side covers even with one carb.

Last edited by gollywog; 02/14/20 9:04 am. Reason: wanted to change it

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Re: Coils [Re: gollywog] #798286 02/14/20 9:25 am
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Allan Gill Offline
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It is possible and a few people do it.

The Boyer dual output is a good coil and rated at 4.2 ohms. The tri-spark one I had fitted for many years was 3 ohm. Worked great but the other year I was getting the occasional misfire. Long story short the insulator on mine was like silicone and had split allowing tracking I think. It worked fine when I put the Boyer back on, but for a Permanent solution I fitted a dyna coil. Been happy since.

It’s mounted in the same position as photod (sadly I can’t find a link to when I did mine)


beerchug
Re: Coils [Re: gollywog] #798332 02/14/20 11:56 pm
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NickL Offline
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The Andrews dual coils for hardley's are very good if a bit large. (well, they are made for hardley's)
Emgo also make a 12v dual output coil that is perfectly satisfactory with pazons boyers etc.
Get one with around a 4-5 ohm primary. 3 ohm ones will get a little hot unless you ride the bike
up at higher revs.

Only my opinion.

Re: Coils [Re: gollywog] #798364 02/15/20 5:51 am
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Mark Z Offline
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Gollywog didn't say he has electronic ignition. Can a single, dual-lead coil work with dual breaker point ignition?

Yes in '68 they went to the two coils being vertical. I think they went to the smaller coils as well. (The '67 coils are larger in diameter.)


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Coils [Re: gollywog] #798369 02/15/20 8:11 am
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NickL Offline
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With some fiddling about, you can get a dual coil to work with 2 sets of points.
I've seen it done here on a couple of bikes, think you have to modify the points plate.

BUT, as he was saying he was looking at dual coils i assumed he has EI.


Moderated by  Allan Gill, Jon W. Whitley 

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