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Thread: 1985 ATC70 No spark..

  1. 07-23-2009, 11:18 PM #1
    Mike_Ham_250R's Avatar
    Mike_Ham_250R
    Mike_Ham_250R is offline Even team-red-rider is cooler then me. Arm chair racerJust too addicted
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    1985 ATC70 No spark..

    Decided to dive into my project already so that this thing will be up and running soon. I pretty much have it narrowed down to not producing spark. There is electricity that goes through the plug wire to the plug because I was able to shock myself by placing a test light in there and grabbing the end of it. If you hold the wire to the engine you can see a small spark jump from it to the engine.

    I have a brand new NGK plug gapped properly so it isn't that. I took an ohmmeter and when I test the ignition coil I took a prong to where the spark plug wire connects to and I tested all of the terminals and everything came up OL for open line. Does this indicate that my coil is bad? Thanks.
    -Mike
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  2. 07-24-2009, 08:59 AM #2
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    atctim
    atctim is offline Administrator The day begins with 3WW
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    If it has not been run for a while - start by cleaning the points. That will give you a stronger spark.
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  3. 07-24-2009, 01:28 PM #3
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    Dirtcrasher
    Dirtcrasher is offline Power User Catch me if you can
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    Mike - Not sure if it's your issue but the 3 70's I messed with recently were all a PITA even though they had some spark. I couldn't get the right size gap because the points were too worn out, I actually elongated the adjusting hole to get the right gap.

    The other 2, I just bought 2 new sets of points and condensors at SH. Your dealer will soak you double or more than SH......

    Between the points and the carbs of these 70's, I honestly find them tougher to tune than any ordinary 200 or 350X etc
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  4. 07-24-2009, 09:05 PM #4
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    night4creeper
    night4creeper is offline At The Back Of The Pack Arm chair racerFirst time rider
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    85 model should be CDI, both mine are. if you don't have it already download the manual from this site. it will help you test out the elec. components.
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  5. 07-24-2009, 10:49 PM #5
    jcorkin
    jcorkin is offline First Time Rider Arm chair racerNew to the board
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    all 4 of my 70s dont have a cdi and they are all 85s...................but points are a big problem with these little guys i would go to dratv.com and order a new set, regardless of it being the problem or not it is a most on these guys, the old points suck and the new ones are a lot better but anyways the points can still create enough energy to shock you as the human body only has roughly 200ohms of resistance and a spark plug has to jump a gap of infinite resistance so it is def a good place to start.
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