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Boyer ignition system

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Just had a ride around the block on my Electra. It is fitted with a Boyer Bransden ignition system. I'm not sure which Mark. It was intermittently misfiring. I looked at the continuity in the ignition wiring with my ohm-meter and found the resistance through the box from the black and yellow wire to the coil connection was 7.16 kilo-ohms, but through the black and white wire to the coil connection it was only 0.715 kilo-ohms. My assumption is that this reading should be the same. Am I right and is my ignition box defective?

The resistance through both small sensor coils, that is from one end of the wires coming off the timing plate to the end of the other wire, was 128.9 ohms. The info sheet says each coil should be 66 ohms. Does this mean the sensors are good enough?

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Good Morning David,

 When I bought my Electra it was fitted  with Boyer Ignition which I replaced witth a Pazon system having previously had problems with Boyer.The resistances  are :-

Black/Yellow to coil conn.  12.8 k ohms

Black/White to coil conn. 5.13  k.ohms

Sensor coils, one is  70.1 ohms and the other is 70.5 ohms.

 If you want the Boyer I removed you can have it.

Regards 

 Frank Anderton

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Thanks for the offer Frank. Was the Boyer fully functional before you removed it?

I see your unit doesn't have equal resistances thro' the Boyer box, but completely different to mine. This still puzzles me.

What were your problems with your other Boyer? And why did you choose Pazon? 

Thanks again,

David

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I am not sure what you mean above when you say you use a meter between a BLK/WHT and BLK/YLW to a Coil connection? If you are measuring from the BLK/WHT-BLK/YLW to an ignition coil connection, then this will be of no use to you at all.

Going back to the first factor of the problem-intermittently misfiring, then one of the first things to look at on a Boyer on the Lightweight is the back of the pickup plate-is it touching the rotor? There could be witness marks in the solder on the board if so. The board has to be moved out from the rotor. Best done by moving the rotor in towards the engine-re-machine the rotor taper to fit further into the cam shaft. If not the case, then suspect an ignition coil, but beware, the failure of one coil will stop both sparks, AND also if one coil (one side) fails (no spark) then it could be the OTHER coil that is faulty!! Change them both.

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A dodgy/failing earth connection from engine back to battery will also cause one side to spark erratically. Simple test is a temporary wire installed from head to battery earth terminal.

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... with the Electra layout but I had similar symptoms on my Boyer-fitted Commando when the daft crimped connectors to the stator plate became intermittent. Worth a check and definitely worth replacing them with something more substantial.

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Frank,

How can I get your Boyer box? I would like to try it.

John,

My earths from the coils and from the engine are good. I get 0 ohm resistance from them to the +ve battery terminal. 

Al,

I'll have another look at something touching behind the plate.

Ian,

My connections seem solid but I'll have another look at these as well.

Thanks gents,

David. 

 

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The Boyer was working OK when I swapped it.I changed it for a Pazon system because of the problems  I encountered when I fitted one to a B40 trail bike I was building.It took 3 attempts for them to supply a working system,The first one didn't work at all ,the second one retarded the ignition instead of advancing it, finally the 3rd one worked ok for a while and then failed half way round a long distance trial.. At this point I scrapped the Boyer and fitted a Pazon unit which has worked fine for the last 4000 miles.

 If you give me a call on 0771149522 let me have your address and I will post it to you.

Frank 

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John,

My earths from the coils and from the engine are good. I get 0 ohm resistance from them to the +ve battery terminal. 

You can have low ohms but also low current carrying capacity, my earth showed 0 ohm but could not carry the required current, as no doubt the strands were breaking internally. Its a simple test to eliminate it as an issue and costs nothing. As its wasted spark then it needs double the current capacity against points with sequential sparks.

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Ian,

Thanks for tip about the crimped joints. One of the coil connections could be moved. I gave it an extra crimp.

David

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Frank,

Tried to call you on the number you gave but didn't get through. Is there a digit missing?

David

 

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No one has mentioned sending the Boyer unit back to Boyer Brandsen for checking. They are a brilliant British firm, only too willing to help - & point out any tips that may be preventing their unit working to its full capacity.

You will find Ernie Bransden at:

Boyer Bransden Electronics Ltd

Phone contactFrindsbury House Cox Street Detling Maidstone Kent ME14 3HE

Look them up here: http://www.boyerbransden.com/aboutus.html

Also - fault finding help: http://www.boyerbransden.com/faultfinding.html

 

 


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