GM Distributorless Coil Mod - Writeup - Page 2
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Thread: GM Distributorless Coil Mod - Writeup

  1. #11
    Senior Member steveo's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    i decided to modify the gm coil so the wires come out the front instead of the back, so it could be mounted flush to a bracket

    [attachment=0:1pmxsek3]2012-10-23 08.43.10.jpg[/attachment:1pmxsek3]

    all it took was drilling straight through, there's nothing there, just plastic.. and you'll find some metal strips which were attached to the spade terminals. they seem to take well to soldering..

    [attachment=1:1pmxsek3]2012-10-23 08.42.59.jpg[/attachment:1pmxsek3]

    poured a little liquid neoprene in the holes for protection

    if anyone wants a black coil like this one (instead of grey/blue/red like most of the aftermarket ones are) -- standard part# DR39T. it's cheap, payed $30 for this one..
    Attached Thumbnails Attached Thumbnails GM Distributorless Coil Mod - Writeup-2012-10-23-08.42.59.jpg   GM Distributorless Coil Mod - Writeup-2012-10-23-08.43.10.jpg  
    --
    restored tuned n piped '84 CB450SC bondo rocket

  2. #12
    Super Moderator longdistancerider's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    That's a good option for connecting.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
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  3. #13
    coldfuzion76's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Nice! I had wondered if something like that could be done, but never had the guts to ruin the coil if I was wrong. Would for sure make bracket fabbing easier.

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  5. #14
    Senior Member xHoladay40x's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Quote Originally Posted by steveo
    i decided to modify the gm coil so the wires come out the front instead of the back, so it could be mounted flush to a bracket

    [attachment=0:fpyooh48]2012-10-23 08.43.10.jpg[/attachment:fpyooh48]

    all it took was drilling straight through, there's nothing there, just plastic.. and you'll find some metal strips which were attached to the spade terminals. they seem to take well to soldering..

    [attachment=1:fpyooh48]2012-10-23 08.42.59.jpg[/attachment:fpyooh48]

    poured a little liquid neoprene in the holes for protection

    if anyone wants a black coil like this one (instead of grey/blue/red like most of the aftermarket ones are) -- standard part# DR39T. it's cheap, payed $30 for this one..
    how far did you need to drill i am thinking of doing it like this
    Check out my 78 cb400 hawk rebuild ------ viewtopic.php?f=5&p=129641

    "In order to be old and wise, you first must be young and stupid"

  6. #15
    Senior Member steveo's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    all the way, you need to solder through the back, but poke the wires through the front..

    i broke both of the the flimsy spade terminals off while drilling, but the wire that attaches to the spade can be dug out with a little carving away of plastic, then just solder your wire to it and fill the hole
    --
    restored tuned n piped '84 CB450SC bondo rocket

  7. #16
    Supporting Member ryan.hope's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    I will update the OP is someone hasnt already done so.
    1982 CM450E Cafe/Brat Build
    1982 CM450E Partout!!!

    Vintage motorcycles are just like women. They're moody and mysterious, they require a lot of maintenance, and you want to ride them all.

  8. #17
    Paul1217's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    I am not sure what the resistor cap is for. You can't just connect a straight spark plug wire from the new coil to the plug? What would it do if you did? And last question, what exactly does the resistor cap do?

  9. #18
    Super Moderator longdistancerider's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Quote Originally Posted by Paul1217
    I am not sure what the resistor cap is for. You can't just connect a straight spark plug wire from the new coil to the plug? What would it do if you did? And last question, what exactly does the resistor cap do?
    This might answer some of your questions. http://www.motorcycleproject.com/motorc ... etech.html
    Yes, you could use a automotive plug connector if you add the screw on cap to the plug so you get a solid connection. Means you have to switch it over everytime you swap plugs since MC plugs come set up for the clip style connectors.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  10. #19
    Senior Member n30n_dave's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Making a mount for the coil was actually alot easier then i thought i used a flat piece of steel and used 1 of the stock mounting holes and bolt i made a sleeve to fit the coil to run a longer bolt though so it tightens down to the plate heres a pic of mine ive cleaned it up since this was a mock up but works well. Definitely a good mod to do for sure and fairly cheap.




  11. #20
    Supporting Member ryan.hope's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Quote Originally Posted by Paul1217
    I am not sure what the resistor cap is for. You can't just connect a straight spark plug wire from the new coil to the plug? What would it do if you did? And last question, what exactly does the resistor cap do?
    The "resistor" in the term resistor cap refers to the spark plug so the resistor cap is essentially the connector that attaches the spark plug wire with the spark plug... it helps to differentiate this end from the end that attaches to the distributor/coil.
    1982 CM450E Cafe/Brat Build
    1982 CM450E Partout!!!

    Vintage motorcycles are just like women. They're moody and mysterious, they require a lot of maintenance, and you want to ride them all.

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