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Boyer ignition set up trouble

Home Forums TR3OC Members Forum Boyer ignition set up trouble

This topic contains 10 replies, has 5 voices, and was last updated by  j phillips 3 weeks, 6 days ago.

  • Author
    Posts
  • #8778

    Anthony Kaye
    Participant

    Hi all, I’m new to the club, I have a T160 with a boyer bransden analogue ignition. I’m having a devil of a job to start the bike and can’t see anything obvious. I’ve followed the instructions to the letter and yet it won’t fire, just a sanity check I haven’t missed anything. Set crank to timing mark 38deg btdc, which aligns with Mark B on my rotor, bottom screw pointer dead centre of the mark. Edge of the ignition magnet is just visible through the top of the hole in the boyer stator and the stator is set in mid position. Am I missing something or has anyone else had problems. Kind regards Anthony

  • #8779

    Angus McLeod
    Moderator

    If it is not starting at all it could be 360 degrees out on the crank. You need to make sure it is on the compression stroke when it sparks.

    Have you checked you are actually getting a spark?

    • #8781

      Anthony Kaye
      Participant

      Hi Angus, I have checked it was on compression stroke on timing side piston, and checked alignment with a crank setting tool. I have used right hand piston viewed from sitting on the bike.

       

      There is a good spark, I must be doing something wrong, but can’t think what.

       

      Any help appreciated

  • #8785

    David Lord
    Participant

    Anthony, when you say it doesn’t start, do you mean on the electric starter or with the kick start or neither?

    And just to check:  has the bike ever started for you?  Have you just fitted the Boyer and now it doesn’t start, or are you assuming it is an ignition problem and not a fuel/carb problem.  In other words what have you done to the bike since it last started?

    David

  • #8786

    C. Edmondson
    Participant

    I had a similar problem last year after rebuilding my Bonnie. It had sat in the shed for over 20 years and the Boyer unit was nearer 40 years old. Any how I had what I thought was a decent spark and I’d gone over the timing a dozen times. More through frustration than logic I bought a new Boyer system, complete with coils, it went first kick after I’d fitted it. I still don’t know if it was the box or the coils which were the problem, I’ve tested the stator on the new system and that’s ok.

  • #8787

    Anthony Kaye
    Participant

    Now that makes some sense, the bike has been standing for the last 30 years. It has run but has always been bad to start. I will send it back to boyer for checking and see where that gets me.

  • #8791

    Angus McLeod
    Moderator

    Go for the easy option first. Try some new plugs, if you haven’t already.

  • #8796

    Anthony Kaye
    Participant

    Wish that was the easy option, new plugs, coils 6v, plug leads, caps. Will check electronic ignition, just in case the magnets are losing magnetism or coils are going weak

  • #8798

    David Lord
    Participant

    Are you sure this is an ignition problem? As it has been laid up for 30 years have the carbs been cleaned and checked?

  • #8799

    Anthony Kaye
    Participant

    I have cleaned carbs in an ultrasonic cleaner and replaced pushrod tube seals, whilst I had the head off I ground valves in too. It has run since, however checking the timing with a strobe I was having trouble with the timing light and adjusted the timing, since then nothing, good spark, wet plugs good compression, but won’t run.

  • #8929

    j phillips
    Participant

    Hi,

    Have you tried bypassing the loom and all the other potential voltage thieves, ign switch, kill switch corroded 40 yr old wires, etc etc by running a feed direct to the Boyer box, possibly even from a separate battery? If it then goes you will know that the Boyer box is simply not getting enough voltage to fire the plugs – this is especially common on T160 as when you hit the starter button the voltage drop can be significant.

    Jim

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