Boyer Brandsen ignition problem

Hello everyone,

I got some problems with the electronic ignition of my Triumph T 140 E
Bonneville. It is one from Boyer Brandsen and it works well for about 20
minutes. Then the engine stops suddenly and and after waiting for some time
I can start it again and drive for another 5 to 20 minutes....
I got two of those electronic ignitions and it´s the same problem on both.
Spark plugs, Ignition coils and cables are new.
Does anybody can give me a hint what the solution for the problem can be?

As English is not my mother tongue I want to say sorry for any mistakes.

Regards,
Udo

 

I once had something like this happen (on a CB550). The ignition
switch contacts were badly worn.

 

Maybe it is not a problem of the ignition itself.....

Thank you.

Regards,
Udo.

 

That sounds like it's overheating.

Are they new or are they both a few years old?

Can you move the black box part of the system somewhere where it gets
more airflow? That *may* cure the problem.

 

Guten tag, mein herr.

I've heard of this problem before - it can be the pick-up overheating
and cutting out.

Hier on zis newsgruppen ve haben der Vaterlandsprachers. Zer ein
gecalled Timo ist der mann!

 

I would check the battery voltage, and that your charging system is
working.

BB ignitions need at least 10volts.

Does it run with the headlight on, and if it does, does it die sooner
than with the headlight off?

The voltage across the battery terminals should rise to about 14 or 14.5
volts at 2500rpm if the charging system is working correctly.

I connected my BB ignition direct to the battery via a relay worked by
the ignition switch in order to ensure that it gets all the voltage
available. I also upgraded the alternator to 180watts and replaced the
rectifier and zener diode with a podtronics electronic
regulator/rectifier.

HTH

 

Well, my first guess would be the petrol tank breather...

 

I had no access to that computer for some days...

Now I know where to start work at. Either overheating or low voltage may be
the problem. I am going to solve it soon.
Thanks to all for your hints.

Regards,
Udo.

 

Hello tunish,

thank you very much for the detailed description of that problem and it´s
solution. I am going to check this out as soon as possible.

Regards,
Udo