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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 04-27-2007, 07:09 PM   #1 (permalink)
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Hi Guys,


Please go easy on me as im no electrical engineer.

just bought a set of 6 volt coils for my 71 t120r (which is still in ice cream containers) as im probably going to be running a boyer Mk III system.

The guy at the shop told me the 6 volt coils are better?? However my old man recons i'm an idiot and should take em back and get the 12 volt coils.

Is this going to have an effect on my wiring in terms of the wiring harness itself?? do I have to run a 6 volt battery??

will my headlight be able to run on 6 volt??

Any help would be greatly appreciated and ive spent too much cash on this heap to stop now!!!!!!!!


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Old 04-27-2007, 09:14 PM   #2 (permalink)
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VB,

The guy at the shop is correct, and your old man maybe needs to brush up on his auto-elec skills. The Boyer will provide a stronger spark using the two 6V coils wired in series, rather than the two 12 coils wired in series, as per the Boyer wiring diagram. The only issue with the 6V coils is that you cannot return to a points-based ignition system (ie. take the Boyer out and put points back in) without replacing the 6V coils with 12V coils.

The rest of the bike can/should remain wired as 12V. The Boyer you intend to use will not work in a 6V system - it needs a minimum of 10V to operate.

I run the same system you intend to use (Boyer MkIII, 2 x 6V coils, rest of bike 12V) and have no issues.

Let me know if you need more detailed info - you have my email address.

Regards,

Pete
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Old 04-27-2007, 10:51 PM   #3 (permalink)
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OzBloke is correect. Boyer recommends (2) 6 volt coils with thier single-circuit trigger system.
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Old 04-28-2007, 04:31 PM   #4 (permalink)
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Actually, you can go back to points trigger system with the 6v. coils IF you fit a ballast resistor, ala the Norton Commandos and T160 Tridents.
Gently point out to dear old dad that the stock system runs the primary windings of the two coils in parallel and the Boyer runs them in series, with the resistance of the two coils adding up to something near the resistance of the two 12 coils in parallel.

[ This message was edited by: Mecchanica on 2007-04-28 15:35 ]
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Old 04-28-2007, 04:53 PM   #5 (permalink)
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Actually, the 12 volt coils in a points system are only in parallell in schematic; technically, in practice, it's one or the other recieving the full 12 volts at a time.

Just a technicality...
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Old 04-28-2007, 05:16 PM   #6 (permalink)
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interesting....my boyer said 12 volt coils were ok and a wiring diagram was supplied.wired up using the old 12 volt coils,starts first kick every time, never misfires or fouls plugs.in fact,its brilliant and been like this 10 years now.also using old fire alarm battery instead of lead acid.current battery is 12 years old
:hammer: :hammer:
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Old 04-28-2007, 05:27 PM   #7 (permalink)
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I think the older Boyers used 12 volt coils, I know for sure the Sparx units use 6 volt coils.
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Old 05-03-2007, 08:21 AM   #8 (permalink)
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IMHO points always provide better performance than earlier electronic systems ... the down side is points only deliver the benefits when well serviced which is a pain and now days expensive replacing them so electronic is the way to go for convenience and reliability

With Boyer and Rita ... 6 volt coils will work well on a twin . On a triple you can at a pinch (better to use 4 volt if you can find them) so long as the bike is not burning oil or carbs are running rich which also seems to be exacerbated by some of the unleaded fuels ... then you will probably experience misfiring as the spark is to weak to over come fouled plugs.

An much better solution is to use one of the new TriSpark systems which can be fitted to twins or triples with 12 or 6 volt coils (ballast resistor required for 6 volt) and goes back to firing one coil at a time instead of the wasted spark systems of Boyer and Rita and has a spark time 10 times the length of any of the systems including points. Fitted one on my triple which produced wonderful results in solid tickover and significant improvement in reliability and fuel consumption. Also fitted one to an A65 yesterday ... just a superb piece of technology .
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Old 05-03-2007, 09:44 AM   #9 (permalink)
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The TriSpark is an excellent system for triples, I agree.

Pazon now has a jigger you can connect to old points that runs them at reduced voltage and they basically live forever (supposedly); haven't tried that rig yet.
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Old 05-03-2007, 10:13 AM   #10 (permalink)
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Not familiar with the Pazon solution ... but as i said points always performed better than the early electronic systems ... just the maintenance to keep that way is a pain... timing and all .

The TriSpark is now available for all Coil ignition twins as well ...
The Trispak is just a revelation on a triple after struggling with Rita’s and boyers over the years ... just takes away the issues on the spark and allows you to focus on the carbs etc to improve reliability and performance ...
I put one on an A65 for a friend yesterday ... haven't done any road work yet but happy to provide the feed back on the outcome .... once i have stopped buzzing after the ride ...

Steve
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