engine not sparking tried everything

Discussion in '2-Stroke Engines' started by ae86lad, Apr 24, 2010.

  1. ae86lad

    ae86lad New Member

    i have 2stroke engine thats not sparking im gettin petrol/air and high compression, ive bought a new champion plug, ive tried using my freinds cdi and magneto but it wont start but his bike will run with my cdi and magneto, ived tried his carb aswell just to see if its gettin the correct amount of air/fuel but it still wont start

    anyone have any ideas please

  2. Bobbyoutback

    Bobbyoutback Member

    Try checking if your bike is shorting out somehow ? also his plug !
    Good Luck .
  3. RdKryton

    RdKryton Active Member

    Disconnect your kill switch and see if it runs. I have seen them short out to the handle bars and kill the spark.

    Good luck

  4. AussieSteve

    AussieSteve Active Member

    ae86lad, you say it's not sparking. Do you mean that the engine is not firing, or that there's no spark at the plug, when it's laid on the head?
    If it's not sparking at all, (at the plug), besides Bobby and Jim's suggestions, another possibility is that the woodruff key for the magneto rotor is missing, (heard of a case of this a few days ago), or sheared.
    Is this a new build or was it previously running?

    An afterthought, if the key is missing or sheared, there will probably still be a spark, but at the wrong time.
    Worth a look if everything else appears OK.
    Last edited: Apr 24, 2010
  5. Al.Fisherman

    Al.Fisherman Active Member

    Since you have used your parts in a friends bike that will rule out the fact that your magneto and CDI are good. Step 1 should be to eliminate anything except what the bike needs to run with. Make sure that ONLY the magneto is hooked up to the CDI and the CDI to the plug. If you are still not getting (if this is the case) spark to the plug, pull the magneto off and remove the magnet (the piece that is on the crankshaft that spins in the magneto) and check the moon key. Some tines there is too much slack and the key could be sheared, and I've heard of them missing from the factory.

    Posted before I read Steve's post.

    Steve, if the key is missing and the magnet is loose there is a possibility of no spark, but your right if the magnet is spinning even without the key, there should be some spark.
    Last edited: Apr 24, 2010
  6. AussieSteve

    AussieSteve Active Member

    Hello Ron, I picked up the key idea from you, in the other thread that you were helping out on.
    An easy thing to overlook.
  7. Al.Fisherman

    Al.Fisherman Active Member

    Isn't that what this forum is all about?:grin5::grin5:
  8. michaelb

    michaelb New Member

    Bike not running

    My bike wouldn't run; I went through everything. It was getting spark. I finally pulled the magneto and there was no woodruff key in the slot. Timing was all screwed up. Put a key in and it ran. mikes:idea: