Engine Trouble **!! MY BIKE WONT START !!**

Discussion in '2-Stroke Engines' started by Caleb Allen, Dec 1, 2016.

  1. Caleb Allen

    Caleb Allen New Member

    I have been given a motorised bike to fix and got it running perfectly, then I come back 4 days later of not riding it and the bike was really hard to start and then stopped working. So I tested the spark on the top of the cylinder head and had no luck. I brought a new magneto, a new cdi and a new spark plug, but it still won't spark. When I ride the bike I hold the clutch in, petal, let go of the clutch, I know that the pistons are moving and that the bike has compression. Inside the magneto case there is rust on the magnet that spins and I'm not sure if it is effecting the ignition. Could someone please help me!!!

     

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  2. crassius

    crassius Well-Known Member

    if you think there is no spark, then hold plug in hand with hand against motor and turn it - if you feel spark, then look elsewhere like is plug wet or dry

    BTW, I don't see a ground wire on your mag in that pic
     
  3. gary55

    gary55 Active Member

    Try it without the kill switch tied in. Also I'm not trying to be a wise guy, but make sure the wires are connected correctly.
     
  4. Caleb Allen

    Caleb Allen New Member

    I have tried holding the spark plug and haven't been shocked and I bought the magneto and noticed that too, would you recommend I attach my old ground wire from my old magneto
     
  5. Jonj57

    Jonj57 Member

    Disconnect killswitch and double check the other wires are connected correctly then try again. Had multiple killswitches fail and make my engine not start
     
  6. Caleb Allen

    Caleb Allen New Member

    I have checked multiple times to see if my wires are connected correctly and have disconnected the kill switch to
     
  7. Caleb Allen

    Caleb Allen New Member

    Yes I have tried this and have had no luck
     
  8. Jonj57

    Jonj57 Member

    Have you done the finger test? turn the engine over while your finger is on the tip of the plug. It'll hurt but it'll tell you for sure whether or not you've got spark. Also another thing that's always good to do while the plug is off is to pedal it down the road and let the gunk inside get pushed out.
     
  9. crassius

    crassius Well-Known Member

    it has to ground somewhere - at this point, I'd say you need to get a multimeter to test things with

    sometimes the bolts fail to ground the mag because of varnish coating the metal
     
  10. Street Ryderz

    Street Ryderz Active Member

    the ground wire is needed!how did it run with out it?here is the ground wire shown attached to mounting bolt ,that black wire is the ground for main coil the solder point on there is ground for lighting coil
     

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  11. Caleb Allen

    Caleb Allen New Member

    The new I brought never had a ground wire, so I guess I should solder my old ground wire from my old magneto on to it ?
     
  12. Street Ryderz

    Street Ryderz Active Member

    The old one was soldered on or did it have a eyelet connector ?
     
  13. Caleb Allen

    Caleb Allen New Member

    It had an eyelet
     
  14. Street Ryderz

    Street Ryderz Active Member

    how many wires on the new coil and what coulor are they?
     
  15. Caleb Allen

    Caleb Allen New Member

    There is a blue wire that runs from the primary coil to the cdi and there is 2 black wires that is attached to the metal and then running to the primary coil then to the cdi
     
  16. Street Ryderz

    Street Ryderz Active Member

    can you take a pic of the wires where they are attached to the coil and frame?
     
  17. Caleb Allen

    Caleb Allen New Member

    Here's a photo of the mag , I did solder on the eyelet just now ( the ugly wire was not there before )
     

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  18. Street Ryderz

    Street Ryderz Active Member

    Woah! the coil is shorted out wired like that.the tab that has all the black wires on it should only have one wire usually white and not used the black wire with eyelet on mounting bolt or the soldered one should run straight to the black wire of cdi! So you can disconnect all the black ones from tab on coil run one of the grounds to cdi and hopefully the coil is still good.
     

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  19. Caleb Allen

    Caleb Allen New Member

    I just tried this and still no spark
     
  20. Street Ryderz

    Street Ryderz Active Member

    try it with old cdi you could have damaged that one with the short circuit!
     
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