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Another plug cap question

Discussion in 'XJ Technical Chat' started by texxgadget, Aug 9, 2009.

  1. texxgadget

    texxgadget New Member

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    The patient in a 1983 Yamaha Seca 900
    Its a project bike coming back from the dead.

    I seem to have a spark problem.

    The shop book says promaries on the copils should be 2 ohms but i measure 5.

    If i unscrew the plug caps off the ends of the spark wires I get about 12000
    ohms on each which is in specs.

    Measuring the secondaries with the caps installed shows a momentary
    17000 ohm and then infinite on the coil for 1 & 2.

    This suggests a capacitor inside the plug cap ?

    On the coil for 1 & 4, it looks like one of my plug caps is showing an open.

    Is it possible to replace wires without replacing the coil ?
    Are there really capacitors on the caps ?

    Thanks in advance !
     
    texxgadget, Aug 9, 2009
    #1
  2. rpgoerlich

    rpgoerlich Member

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    There are resistors is the caps. They are typically 5kohm. On some you may be able to unscrew the cap to access the resistor. Be alert as there is a spring, a disc and the resistor in there so you know how to put it back together once you clean it and/or replace the defective resistor.

    I've found it easier to just order a new set from Chacal :D .
     
    rpgoerlich, Aug 9, 2009
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