No spark issue

Discussion in 'Motorized Bicycle Trouble Shooting' started by D.Knight, May 20, 2017.

  1. D.Knight

    D.Knight Member

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    I've replaced the spark plug with an ngk BP6HS, replaced the cdi with the ngk version, and I've tried 2 magnetos. The motor is making metal to metal contact with the frame, and I've tested everything with a multimeter and everything reads out fine. The magneto is at the 1 o'clock position when the cutouts are at 12 and 6. Not sure what else to look for. :-||
     
  2. crassius

    crassius Well-Known Member

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    well, you're testing something the wrong way unless you have two bad CDIs (which is rare, but can happen)

    the only meter test that is useful is to check for about 350ohms between the blue wire of the mag and some metal part of the motor - if you do that test while everything is hooked up, you can spot a shorted kill switch or CDI that way too

    another useful test is to hold plug in hand and hand against metal of motor to see if spark is there, but not visible
     
  3. D.Knight

    D.Knight Member

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    I don't have the kill switch hooked up and it's not reading anything from Blue magneto wire to motor. But from Blue wire to the magneto itself is 317

    Also, this is the 3rd cdi I've tried
     
    #3 D.Knight, May 20, 2017
    Last edited: May 20, 2017
  4. crassius

    crassius Well-Known Member

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    in that case, mag is not grounded to motor - armature of mag should be grounded, use meter to find why not
     

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