No Spark FIXED

Discussion in 'Tech Area' started by birdmannn101, Sep 25, 2013.

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  1. birdmannn101

    birdmannn101 Member

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    I finally fixed my friends CT70 which had no spark. I searched the site to see what I haven't checked yet and everyone kept saying, "Check the battery connector and it needs to be connected to the battery because of the two black wires need to be connected."

    I just knew that this was not my problem because this friend of mine has been driving this CT70 for months with no battery. The only problem he was having prior to the "NO SPARK" problem was spark plug fouling. We would clean the plug and he was off riding again.

    To make the long story short... I put a piece of wire between the two black wires in the battery plug and Waa-Laa it had plenty of spark. He had a smile on his face as he left to go buy a new battery.

    Now, Can anyone tell me how this bike could drive with no battery all those months???

    Dan
     
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  3. Enginedoctor

    Enginedoctor Well-Known Member

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    magic!

    or maybe the old piece of wire that was doing the same thing simply fell out... there's no way the voltage would simply go from the one lead to the other, unless it's conveniently shorted upstream, which it's not, considering you didn't have spark before you jumped these wires. I've seen connectors on these bikes that jump that lead, battery or not. they're square and fit right into place, so i doubt one would have simply fallen off.
     
  4. cjpayne

    cjpayne Well-Known Member

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    Wild guess here. There might have been a jumper that worked loose and fell out. Might be laying on top of the motor down in the "catacombs" somewhere.
     
  5. cjpayne

    cjpayne Well-Known Member

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    Dammit Doc, you beat me to it!!!!LOL
     
  6. Enginedoctor

    Enginedoctor Well-Known Member

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    dude by like 30 sec. too. lol! ....great minds think alike...
     
  7. birdmannn101

    birdmannn101 Member

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    It must be magic because no one ever put a jumper wire in that plug. Say, while checking threads on "no spark" someone said, "No battery needed but the black wire will need to be "jumped" to complete the ignition circuit. Disconnect all the bulbs, without the battery voltage from the lighting coil goes up to 41 volts, your bulbs will pop in short order."

    Do you think it had enough lower volts to half ass run and foul the plugs? Thats a heck of an arc...
     
  8. Enginedoctor

    Enginedoctor Well-Known Member

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    okay birdman... i don't think you're getting it. the voltage from the lighting coil doesn't go to the ignition coil. there must have been a jumper wire there of some sort. case closed. maybe you never put one there, but it had to be there. the ignition primary voltage that goes to both the kill switch and the ignition coil doesn't have enough electrical potential to make it from one side of that connector to the other. when there was no problem with it, let's face it, you probably weren't looking for a problem, so maybe the wire eluded you. now that the spark went out, then you begin to lift the seat and poke and prod.
     
  9. cjpayne

    cjpayne Well-Known Member

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    Take the jumper out!!! Get it running. Post how it works.
     
  10. birdmannn101

    birdmannn101 Member

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    I will, as soon as he picks up a battery. Thanks for all your help...Dan
     
  11. racerx

    racerx Administrator
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    I agree with the self-ejecting jumper theory put forth by the 'doc & cj, by far the most likely explanation. A small piece of wire, or a staple could simply fall out and exit the frame without a trace.

    That said, possessing just enough electrical knowledge to dangerous without fully understanding AC, there are aspects of these electrical systems that I view as arcane, to say the least. Topping the list is the fact that EVERYTHING is run to ground. That can produce some ostensibly bizarre effects...akin to having a car dome light come on when the LF turn signal bulb has a broken filament, which I've seen firsthand. Thus, shorts and breaks can sometimes both produce similar results...if the tide is just right, or something:43:

    Case-in-point, I ran across an HK0 that couldn't be switched off. No key position just would kill the spark. The cause turned out to be the modular connector, which had been pulled apart when the gas tank was installed. Easy fix...not-so-easy diagnosis.

    Thus, there could a shorted/broken lead as yet undetected. Highly improbable but not impossible.
     

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