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intermittent spark on right cylinder

Discussion in 'The Garage' started by sean colleary, Jun 2, 2018.

  1. sean colleary

    sean colleary XS650 Addict

    trying to set timing to day with my timing light i have good light coming when i clipped on to the left side but when i go to the right plug wire i get no light ive tried moving the clip around randomly ill get a light manly when i rev the motor thats when the light intermittently comes on i tested the coil and its 4.5 omes
  2. sean colleary

    sean colleary XS650 Addict

    Nvm it was the plug wires
  3. 5twins

    5twins XS650 Guru Top Contributor

    I was going to say that. The plug wires are usually something I replace right off on one of these, often the plug caps too. The caps can and do go bad. They have a rather odd resistance rating of around 8K ohms but when they go bad, that value starts to climb. Eventually, as it gets too high, it will start choking off the spark. If I don't replace the wires, at the very least I trim a little off each end to get to some fresh wire.
    sean colleary likes this.
  4. 79XStLouis

    79XStLouis XS650 Enthusiast

    The left plug cap was not seated tight with my park plug wire and caused n intermittent loss of power. Trimmed off 1/4" spark plug wire and screwed the cap on...good as new. I was sure it was a carb or fuel issue for a long time, very tough when problems pop in and out.
    sean colleary likes this.
  5. sean colleary

    sean colleary XS650 Addict

    ya i just ordered some new ngk plug wiring and ends just so i don't have to mess with it anymore

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