Magneto fine, CDI fine, sparkplug fine, NO SPARK! need help!

Discussion in 'Electrical' started by skinnerman, Jul 28, 2014.

  1. skinnerman

    skinnerman New Member

    I did post previously on this but now I know what the real problem is, kinda.

    My magneto seems to be working fine, I get around 30+ AC volts between the blue and black wires,
    and the engine is properly grounded. But when I run all the ohm checks I only get 500 ohms between the black and blue wires
    (red lead from meter on black and black lead from meter on blue) when I should 130k - 150k. The magneto is also soaked in oil, yet it still produces the 30+ vAC.

    The kill switch is also fine. All the connecting wires are fine and there is no bare contacts or shorts.

    The CDI shocks me really bad when I go fast, but when I put a spark plug on it, nothing happens,
    and even when I hold the spark plug I don't get shocked. If I take the spark plug out and touch the contact
    inside the spark plug cap I get shocked.

    But there's no spark! Why!? (btw, I've done this test with 2 different spark plugs).
    Last edited: Jul 28, 2014
    andres1436 likes this.

  2. crassius

    crassius Well-Known Member

    sounds like 2 bad plugs or a bad cap on your wire to the plug - try taking the cap off and wrapping the copper wire right onto the plug

    oil on the mag usually means a crank seal is bad
  3. jaguar

    jaguar Well-Known Member

    500 ohms is acceptable for the stator coil (blue to black wires).
    The CDI can output voltage enough to shock you but not enough to cause a spark. replace it
  4. Fabian

    Fabian Well-Known Member