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Coil failure

Discussion in 'Norton Commando Motorcycles (Classic)' started by Thomasdunstall, Jun 13, 2018.

  1. Thomasdunstall

    Thomasdunstall

    Joined:
    Jan 18, 2012
    Hi I've had an ignition coil failure just after a complete engine rebuilding.
    Coils where a pair of new PVL made in Germany. Pazon ignition fitted.
    I made a stupid mistake wiring the ignition plate with inverted YB and WB wire...immediately turned to correct. Could this have been damaged the ignition?
    Then I turn to a new pair of commercial Coils from RGM. After just 1200 km I've the same problem. I've repalaced one of them and everything seems to work fine.
    What do you suggest to check to be sure to avoid a new failure in the future?
    Previous Coils worked for years with no problems.
    Thanks in advance
    Thomasdunstall
     
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  2. laurentdom

    laurentdom

    Joined:
    Nov 30, 2012
    Hi Thomas and All,

    Maybe it's not related with your issue, but I had a coil failure with a Pazon Sure Fire ignition. Andy at Pazon's told me that it was highly important to have the coil(s) properly cooled (i.e. using the heat sink provided in the Pazon kit / locating it in air flow ...). What I hadn't made correctly.

    Hope this helps,

    Laurent
     
  3. DogT

    DogT VIP MEMBER

    Joined:
    Jan 20, 2009
    I bought some new coils from MAP for mine with the Pazon SF and not long after, one coil failed. I took it apart and the wire from the = or + (I forget) had fallen off the inside of the terminal. I soldered it back on and it worked, but I don't trust it. I bought a new one. They look a lot like the PVL, but I don't think there are any markings on them.
     
  4. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    i am very surprised that heat is an issue in failure of 6volt coils.. I had mine for years in the rear fastback on long ht leads... the amount of aircooling was minimal they were hot to touch .but failed? never
     
  5. laurentdom

    laurentdom

    Joined:
    Nov 30, 2012
    I got the problem with a single 12 volts dual output coil.
     
  6. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    which Pazon is it? unless its a Smart fire using a low impedence coil, i would be inclined to use two 6volt coils in series
     
  7. Brooking 850

    Brooking 850 VIP MEMBER

    Joined:
    Oct 3, 2011
    I have just been up to see Andy (he lives 30 km's away)at Pazon to have my Sure Fire system tested .
    I installed this system late 2011.

    I had a small intermittent misfire issue with the RHS and that showed up in low speed idle whether hot or cold and could go months and never show up.
    Andy spun up my card on his test rig, measured the coils , tested the magnets on the rotor and the black box and all is well.

    I kept thinking my problem was a carb problem at idle, but it turns out it was one of the 5K NGK plug caps that while holding a test meter on it, it would break down if you gave the cap a slight twist.

    Andy thinks a resistor inside the cap is faulty.

    Thats why it would only show up occasionally and given I ride my bike often and as Nortons shake at idle , the problem wasnt there when out at road speeds.

    I use 2 x 6v coils.
    2 x new HT leads and 2 x new NGK 5 K caps. Yet to fit and test as Im replacing a head gasket.

    Great service and he is very busy shipping out top quality units.

    Regards Mike
     
  8. oldmikew

    oldmikew

    Joined:
    Jul 25, 2015
    Cannot fault my Pazon
     
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