). Does anyone recognizes this Boyer Bransen ignition

Discussion in 'Airheads' started by MaraBiker, Mar 28, 2012.

  1. MaraBiker

    MaraBiker Vozi Miško!

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    #1
  2. PaulRS

    PaulRS Dutch fool

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    Old, very old.
    Probably one of the first BB sets.

    I used them once, didn't like it.

    P.S. Seller states; Die Teile sind teilweise 35 Jahre alt und gebraucht!

    35 year old, used parts.

    Paul.
    #2
  3. MaraBiker

    MaraBiker Vozi Miško!

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    Thanks for info.
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  4. chasbmw

    chasbmw Long timer

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    its an old basic BB ignition, I would assume that the big box in the photo is a pair of coils with the police equipment radio interference reducing cover, but thats a bit of a guess.

    I used lots of Boyers and liked them, and fitted one to my R80 about 33 years ago, but I would not expect one that old to be working properly.

    Charles
    #4
  5. Hawk Medicine

    Hawk Medicine Coyote's Brother

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    I had the identical Boyer system in my R90/6 from about 1988 until 2005 and it lived up to it's reputation 100%.

    It worked perfectly, good starting down to less than 20deg, and it cured the engines pinging with regular gas. In fact, I ended up selling it to another Airhead and I presume that it's still working.

    Great system.
    #5
  6. Kai Ju

    Kai Ju Long timer

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    I just installed one on my '77 R100/7.
    Engine runs great but became a little hard to start in lower temps, i.e. 40's F, until I slightly retarded the timing.

    pm me for a PDF of the installation instructions I got from BB if you go ahead and buy it.
    They tell you to route the ground wire down into the front cover through the diode board grommet. I curled my harness up on the left side, in front of the left coil and used the coil mount bolt as the ground. The same one that BMW uses, btw.
    Mounted the box to the rear of the coils against the frame with a rubber block and beefy zip tie.

    Looks like all the parts are there, but I don't know what the bigger box is for. Caveat emptor, since it also says: Laufleisting unbekannt, which means that the seller doesn't know whether it actually works...........
    #6
  7. MaraBiker

    MaraBiker Vozi Miško!

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    I'll keep an eye on this. But I think that I am going for the new one from Motobins. New=I know it's works.
    #7
  8. bmwrench

    bmwrench Long timer

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    Why go to Great Britain for a Boyer? Many vendors in the states sell them.
    #8
  9. Kai Ju

    Kai Ju Long timer

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    Shipping cost.
    #9
  10. MaraBiker

    MaraBiker Vozi Miško!

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    :thumb
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  11. caponerd

    caponerd Kickstart Enthusiast

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    'cos the buyer is in Herzegovina?
    #11
  12. bmwrench

    bmwrench Long timer

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    Whoops.
    #12
  13. chasbmw

    chasbmw Long timer

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    Mara,

    If you go for the microdigital, remember to fit 5000 ohm resistance plug caps as made by NGK.

    The earthing of boyers is fairly critical. Boyers used to use the coil earth, but the later instructions are to use the (removed) condensor attachment point. I would follow the instructions!

    Charles
    #13
  14. MaraBiker

    MaraBiker Vozi Miško!

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    Yes, I live far far away :D
    And chasbmw thanks for the info.
    #14
  15. Kai Ju

    Kai Ju Long timer

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    Can you speak from a bad experience using the coil/frame ground ? I went that route because the grommet to get through to the condensor mount was so hard that I couldn't get the wire through it. That's when I started looking for an alternate ground.

    So far so good.
    #15
  16. chasbmw

    chasbmw Long timer

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    I do not have any direct experience, but boyers have been known to behave in unexpected ways, and there has to be a reason why they changed the wiring to provide a more direct earth.

    Charles
    #16
  17. pommie john

    pommie john Long timer

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    Most of the problems with Boyers can be put down to faulty wiring and poor connections. Boyers ( at least the analogue ones) like good voltage. A bit of corrosion in a connecter coupled with a poor quality switch or fuse holder and there;s enough voltage drop to cause problems and everyone blames the Boyer.

    I have a Norton race bike that I built in 1983 and it still has the same Boyer on it still working.
    #17