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  1. #1

    Help me make sense of my electronics test results please. No Spark

    I just ran all the tests I could think of. These are my results:

    The Hall Effect sensor can be tested by powering it with a 9 volt battery, and rotating the engine slowly to observe the resistance change as each flywheel trigger magnet passes the sensor. Positive 9 volts connects to the Brown stator wire, Negative 9 volts to the Gray wire (Gen III domestic stators only). At the point of resistence (magento rotates over the magnet) it should read 25 ohms. (I saw a post where it said 107 ohms was correct for my year ski/ CDI unit but cant verify that as the manual says 25 ohms)
    My Results.
    Green Wire: (PTO) 108.4 ohms
    Blue (Cen) 108.5 ohms
    Red (Mag) 106.6 ohms

    Video showing my test:


    Magneto stator coil test
    Exciter coil #1 Black to Purple: 5.5 ohms (Mine: 5.6 ohms)
    Battery charging coil Red/Purple to Yellow: 0.75 ohms (Mine: 1.1 ohms)
    Yellow or Red/Purple to engine block: Infinite resistance (Mine: Infinite)
    Black to engine crank case: 0.0 to 1.0 ohms (Mine: .9 ohms)
    (maximum is 1.0 ohms, should be less)

    Ignition coil Testing
    Ignition coil primary: 0.35 ohms each coil
    Measured from Black/White to Yellow/Brown, Black/Blue, Black/Green (Mine: .7 ohms each wire, a little off. Whats your thoughts on this? Would it cause me not to get any spark?)Black to Black/White: Infinite resistance (Mine: Infinite)
    Primary Black/White to ground: Infinite resistance (with primary coil wires not connected to ground) (Mine: Infinite)
    Ignition coil secondary, without plug wires: 1200-1600 ohms to ground (Im not clear about this test, how to. If anyone has some insight and think I need to run this please advise me on how to)

    What do you think?
    Bad Stator or CDI unit?


  2. #2

    Join Date
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    Did you try cranking it with the 9v hooked up to brown wire going to the stator (not the CDI) ?
    If you get spark then its in the CDI
    Make sure that you have a good battery. I just had that happen. Switched batteries to a new one and it fires right up. Tested the old one and it had 12v but barely 12v and it was enough to not spark.

  3. #3

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    Did you try cranking it with the 9v hooked up to brown wire going to the stator (not the CDI) ?
    If you get spark then its in the CDI
    Make sure that you have a good battery. I just had that happen. Switched batteries to a new one and it fires right up. Tested the old one and it had 12v but barely 12v and it was enough to not spark.

  4. #4
    Yes I did, no spark

    On your coil,the plug wires have resistance,the longer it is-the higher the resistance.
    They should be 3000-5500 ohms. I didnt do this test yet. Is it critical to analyze the CDI?

    Check the cranking voltage on the red/pur going to the CDI,that needs to be 10.5V or higher.
    Those CDI did have a habit of getting stuck off-disconnect the red/pur wire,reattach and check for spark (discon/reattach every time you crank it)
    I ran these test with 2 seperate batteries. Both were at 12.5 volts before cranking the engineTo the CDI: 9.5 v
    From the CDI: 5.5v


    The most important CDI output is on the brown wire.
    It needs to be around 9 volts while cranking,pretty sure 7 volts will be too low to start..
    4.9v to 5.5v What does this mean?

  5. #5
    What are the specs I should look for when buying anew battery? Im just going to get a new one I guess

  6. #6
    BlueFishCrisis's Avatar
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    12V 19A YB16CL-B or Equivelant. AGM (Absorbed Glass Mat) battery is preferred. Spend the extra $$$ and get the AGM type IMO.

  7. #7
    stubburnjdh's Avatar
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    You need more than 10.5 volts while cranking. Make sure you are getting that before you go any farther.

  8. #8
    What if I hooked it up to a charger while cranking it?

  9. #9
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    Quote Originally Posted by heebeha View Post
    What if I hooked it up to a charger while cranking it?

    NOt a good idea.......that can fry a stator

  10. #10
    Thats what I thought. I bought a new battery. Its setting up as I type. Fingers crossed

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