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Thread: atc 70 no spark

  1. #1
    Join Date
    Oct 2002
    --
    80

    atc 70 no spark

    ok guys I bought a little 1983 atc 70 , and its been a while since I worked on electrical issues with 6volt system (and my memory has gotten worse the older I get )
    but it has fire to the coil but no spark, im thinking coil is bad , tried a couple other s off different bikes still no luck , am I missing something here -- thx in advance

  2. #2
    Join Date
    Nov 2015
    Location
    Davenport iowa
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    1,144
    Plenty of other things to check first. Spark plug wire? Snip off a 1/4 " and reinstall the plug cap. Broken wire somewhere? Bad ground? Is that a CDI motor? Coils do go bad but not often. Just gonna take some digging around and a ohm's meter if ya have one.
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  3. #3
    Join Date
    Jul 2009
    Location
    South Florida
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    6,802
    Coils rarely go bad , almost always the points and condenser .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

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  4. #4
    Join Date
    Oct 2002
    --
    80
    so if there is fire going to the coil the problem could still be points?

  5. #5
    Join Date
    Jul 2009
    Location
    South Florida
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    6,802
    Yep , probably just needs a little more fire
    It’s a very simple set up .
    Pull the recoil and the cage and check the points gap at top dead center . It should be set at 16 thousandths .
    Try cleaning the contacts with a piece of sand paper .
    I bet you will see a nice big spark after a light sanding.
    Make sure your using the OEM coil .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  6. #6
    gimmeamidget is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2014
    Location
    utah
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    436
    Yup sand paper trick works most the time

  7. #7
    Join Date
    Oct 2002
    --
    80
    Quote Originally Posted by gimmeamidget View Post
    Yup sand paper trick works most the time
    ok guys sanded flywheel and points and set to 16 th but now I have no spark going to coil???????

  8. #8
    Join Date
    Oct 2002
    --
    80
    ok got spark back to the coil, much brighter this , time , but still no fire through coil ,

  9. #9
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,802
    Is it a factory 6 volt coil ? Got a picture ?
    The later coil wires are removable . I would take it apart and and make sure your connections are good .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  10. #10
    Join Date
    Oct 2002
    --
    80
    yes its a oem 6v ac coil, I had a aftermarket coil I tried also wih no luck, really pulling my hair out here messed with it all day yesterday , hate to throw a bunch of money at it trying to fix problem when I haven't even heard it run

  11. #11
    Join Date
    Oct 2002
    --
    80
    forgot to mention I had already removed coil , wire and snipped the end off, I also sanded the coil mount thinking it might not grounded , also cut the wires to the kill switch . have u guys ever seen anyone with a neutral safety switch issue on one of these?

  12. #12
    Join Date
    Oct 2002
    --
    80
    can it still be a points and condenser issue ??

  13. #13
    Join Date
    Oct 2002
    --
    80
    ok got it running got another coil from a friend , and it fired right up , but runs like crap and back fining through carb , think im going to need a sset of points and condenser anyway , its also leaking oil around cover next to spark plug hole ( hopefully just a gasket , thx for all u guys help getting it to firing , now I have to fix the other million things it needs lol

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