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#643538 - 03/09/16 3:03 pm Re: Dual plug head question [Re: jon powers]  
Joined: Feb 2007
Posts: 447
edunham Offline
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edunham  Offline
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Joined: Feb 2007
Posts: 447
Ewing. NJ
I have a dual plugged BSA 441 running points and no battery. When I retarded the timing for optimum timing, I found that it was ATDC at idle or for starting, which made kickstarting difficult. I brazed up the slots in the advance unit to lessen the amount of advance (actually, in this case the amount of retard!)and it worked great. Before doing so, I asked Ed V (BSA unit singles guru) about using an ET advance unit. His advice was not to. He said that the different points cam would likely end up causing problems.
I am, however, using a dual tower coil. If I am understanding correctly, I would be better off with 2 single tower coils. While my 441 fires right up and goes fine now, it would not be hard to wire up a couple of my spare Lucas coils and see if it makes a difference.

Ed from NJ

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#643567 - 03/09/16 7:38 pm Re: Dual plug head question [Re: Gary Scallen]  
Joined: Jan 2014
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NickL Online content
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NickL  Online Content
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Posts: 3,315
Aus
Well that would be a job for an enterprising chap, make a new ignition box for the standard Boyer with a reduced say max 4 or 5 deg retard instead of the 10 deg as supplied.
Someone like DaveM could sort that i would think. And one for the standard Pazon. I believe the pickup coils are different values on each system but depending on how you approach the design this may or may not matter.
In fact if you had a word with either company the chances are they would mod a pre-potted one for you anyway. (at a price) As they are analogue units the chances are it would be just a capacitor /resistor change anyway.



#644002 - 03/12/16 6:02 pm Re: Dual plug head question [Re: Gary Scallen]  
Joined: Jan 2014
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Gary Scallen Offline
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Gary Scallen  Offline
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Joined: Jan 2014
Posts: 46
Michigan,USA
Wow! Thanks for all the input,some of it I don't even understand but it was fun reviewing all the responses. After talking to John Healy over the phone I decided to send my points assembly to Ed V and have him modify it to retard the advance as several have advised. I also ordered two twin tower mini 3ohm coils. I think this way the stock wiring harness will be easy to modify although I will use a tympanium regulator/rectifier. Any more imputed would be appreciated. THANKS

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