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Thread: 1985 honda 250 es big red no spark

  1. #1
    Join Date
    Apr 2016
    Location
    Ohio USA
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    4

    1985 honda 250 es big red no spark

    Well I have a project and the first thing I did was check the spark and there wasn't one. We are kick starting it because the battery has sat for 3 years. Would a new battery give spark? What all do I need to check?

  2. #2
    Join Date
    Mar 2013
    Location
    Missouri
    --
    97
    Battery would not have an effect on spark. First thing I would try is replacing or cleaning the spark plug. If that doesn't work, take off your gas tank and check out your ignition coil and make sure it's plugged in. If it looks good. Follow the wires from the CDI (left side on the top end of the engine) and follow the wires from it to your wire harness and make sure they are plugged in. Also. Un-plug your kill switch from your wire harness, as it can malfunction and make it as if you have it turned to "off" at all times.
    If that all seems good, I would order a new ignition coil, CDI box, and spark plug. That should fix it. If they don't work, your gonna want to pull the CDI apart. Sand down surface of magneto and make sure it's not rusty in there.
    Once you've done all that, you should have spark for sure. My guess is that you need a new coil though.

  3. #3
    Join Date
    Apr 2016
    Location
    Ohio USA
    --
    4
    Okay thanks you. What is the cdi and what does it do?

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  4. #4
    Join Date
    Apr 2014
    Location
    Edmond, KS
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    2,591
    It takes the place of points. Basically an electronic ignition. I'm not sure that you can pull the cdi apart on these. On the 185/200 engines, there is a cover on the end of the cam that says cdi on it. You can remove it and sand the magneto underneath that.

  5. #5
    Join Date
    Apr 2016
    Location
    Ohio USA
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    4
    Okay yeah I wanna check the magneto

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  6. #6
    Join Date
    Feb 2011
    Location
    fingerlakesny
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    2,834
    Pull apart every connector....put a dab of diaelectric grease on them . Even the ones under the headlight . always works 4 me.
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  7. #7
    Join Date
    Apr 2016
    Location
    Columbus, IN
    --
    60
    also maybe have someone wiggle the kill switch around while you kick it, i have seen some finicky kill switches that dont always allow ignition in the 'on' position. I also found on my trike that the kill switch is wired backwards so 'off' is on and 'on' is off haha

  8. #8
    Chopsaw is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    May 2013
    Location
    St. Louis
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    505
    just had the same trouble with my 85 . It was the kill switch .

  9. #9
    Join Date
    Jan 2009
    Location
    ohio
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    1,768
    Most of the ones we found like that have been the neutral wires on the pass side of the engine. Remove that cover its held on with a 10mm bolt and clean and check those two connections they normally get corroded cause where they live down low and behind that cover that gets packed with mud and what ever else they drove it thru
    If its on the internet its got to be true they can't put any lie's on the internet

  10. #10
    Join Date
    Apr 2016
    Location
    Ohio USA
    --
    4
    Is it possible to wire bypass the kill switch to check it?

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  11. #11
    Join Date
    Jan 2009
    Location
    ohio
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    1,768
    Should be able to just to unhook it I'm pretty sure it just grounds out the black and white wire
    If its on the internet its got to be true they can't put any lie's on the internet

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