Help "NO Spark"

Discussion in '2-Stroke Engines' started by 210061741, Nov 8, 2009.

  1. 210061741

    210061741 Guest

    Now my engine was running somewhat befor i tore it down.
    Now i put it together and i seem to have no spark.

    Which way does the Magneto Magnet go on.

    Kewway tipped toward Sprocket.
    Or tipped toward the wire hole in the case.

    I'm not sure if i have that on backwards.

    Other than that i'll go over all my wiring tommorow.
    Must have something messed up.

  2. Al.Fisherman

    Al.Fisherman Active Member

    The blue wire will be at the top. If you look at the coil closely from the wire wound end (opened end away from you) you will see that one side, more coil wire sticks out then from the other side. The side with the least sticking out goes into the cavity first.
  3. 210061741

    210061741 Guest

    Yes the coil will only fit in one way.

    I think you said the blue wire is on top?

    I'ts the keyed rotor that i'm not sure about.

    PRY CAREFULLY is waht your pic says.

    I think depending on wich way you put it on the shaft.
    will make a differenec in the direction of that keyway on the angle.

    Which direction should the keyslot go.
  4. GearNut

    GearNut Active Member

    I just looked at the mag in my trashed engine. With the key in the 2 o'clock position on the shaft, the offset keyway in the magnetic rotor is towards the sprocket.
    Last edited: Nov 8, 2009
  5. Al.Fisherman

    Al.Fisherman Active Member

    Actually you can indeed flip the coil over and install it. If done this way the thin insulators will get crushed.
  6. 210061741

    210061741 Guest


    Just to confirm.

    Blue wire from coil (top lead) to blue CDI wire.

    Black wire from coil (screwed on, grounds to engine block) to black cdi wire.

    White wire not needed.

    Ground and yellow wire from throttle not needed.

    If i connected the white wire to the blue and the black wire to the black would that fry my CDI or Magneto or both????

    Is there an easy way to test these with a voltmeter to verify???

    I'm sure i did that at least once.

    A wile back i ripped the wires off the magneto when the front motor mount broke.
    I soldered new wire back on but i only had white wire.
    So i don't have a blue one.
    I have two white ones.
  7. 210061741

    210061741 Guest


    At one point in time i did install the coil the wrong way.
    But i realized that before i tightened down all the screws.
    I guess it is possable that i broke the thing.

    I'll double check my connections and if it's still no go.
    I'll need to get a new magneto.
  8. 210061741

    210061741 Guest

    Finally got this problem figured out.
    Thanks to you guys and the other threads allready posted.
    After checking the resistance at the blue wire.
    I found i had none.
    So you say the coil is shot.
    I removed the coil from the motor.
    Broke off the plastic shield on that side of the coil "the Bakealite"
    when i lifted up the copper tab that the wire connects to.
    I noticed a microscopic wire under there taht wasn't soldered.
    Looks like it only made connection by bending the copper tab down.
    So i heated the copper tab with a lighter cause i couldnt find my soldering iron and put a little bead of solder on it.
    After that the resistance was correct and the coil was fixed.
    I sealed it all back up with a big gob of gasket sealer and wrapped duck tape around the blue wire and the coil so if it gets pulled at all it won't pull the wire off the coil.

    Sure a new coil is cheap and i plan to buy one.
    It is waiting for it to get here that woulda killed me.

    Also when i tore the engine down I did some porting to the crankcase transfer areas and couldn't wait to see how it would run.

    I'll post those results in the Teardown thread of mine.

    Thanks again Motored
  9. Bernie

    Bernie Member

    What make motor and how old? I'm not sure you mentioned it, but I could be wrong old sport. I've been wrong before.

  10. 210061741

    210061741 Guest

    It is a grubee gt-2b 48cc.
    Iv'e got about 1600 mi on her now.
    Anyway i think most of the HT's run the same maagneto.
    It was manufactured in july this year.

    For anyone having spark issues.
    Check the resistance of the magneto.
    If the blue wire is nil.
    Brake the plastic side of the magneto off and lift up the contact and look for that microscopic wire.
    Burn the varnish off the wire very carefully.
    And solder it to the contact.
    If your resistance is now in the 300 ohm range your good to go.
    Otherwise buy a new magneto