GM Distributorless Coil Mod - Writeup - Page 3
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Thread: GM Distributorless Coil Mod - Writeup

  1. #21
    toehead's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Quote Originally Posted by ryan.hope
    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.

    That's not quite it.

    There is actually a resistor in the cap. It is there mainly for radio emission suppression and to shape the spark duration a bit.
    1980 CX500C, road warrior
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    1981 GL1100 14,000 miles. Currently restoring, 90% done
    1981 GL1100 50,000 miles. Currently restoring, 20%
    1981 CM400C, 19,000 miles. Currently getting rideable, cosmetics to follow.

  2. #22
    jokunokun's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    I just finished this mod last night. I soldered the wires in and have them coming out the front. I can use one of the original mounting holes and I just need to finish fabricating a mount for the other so it's not flopping around. The neighbor suggested a zip tie (I politely declined). Haven't had a chance to get out on the road yet but it starts up quick and strong. Not a bad mod for about $40 total for everything. I'll post pics this weekend when I get a few minutes

  3. #23
    Senior Member mike in idaho's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    NGK resistor plug caps had a small resistor inside that can be removed and replaced with a piece of solid core copper wire or brass tubing. Look in the end of the cap, if there is a screwdriver slot in the brass end it can be unscrewed and the resistor removed. I've heard that the latest versions of the resistor caps can't be dissassembled but the earlier ones can.
    '65 YG1
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  5. #24
    jokunokun's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Here's a few pics of my install. Pretty basic, and it tucks in there pretty well. I just need to get the wires to lay where I want them. Thanks for the write up and everyone's input on this mod.
    Attached Thumbnails Attached Thumbnails GM Distributorless Coil Mod - Writeup-image.jpg   GM Distributorless Coil Mod - Writeup-image.jpg   GM Distributorless Coil Mod - Writeup-image.jpg   GM Distributorless Coil Mod - Writeup-image.jpg  

  6. #25
    Super Moderator longdistancerider's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Just cut the wires down to size, tie wrap them together as needed. Hard to short these wires out
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

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  7. #26
    Neil1750825's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Hey guys. New to forum and not sure how to navigate real well yet. I have a 78 hawk II. Runs great with no issues. Just wondering, is there any noticeable performance gain from making this swap? The coil I have seems to operate just fine. Was just wondering if it was worth a pony or two. That being said, if not, are there any relatively inexpensive mods to do to these to get a few more horse? Just curious what kind of options there are out there. The thing starts and runs like a champ though so not really looking to hurt the reliability/startability of the bike.

  8. #27
    Super Moderator longdistancerider's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Welcome aboard.
    As you may have discovered there are no "performance" parts made for these bike. But then you're getting @43hp from 395cc's or 1.1hp pre 10cc's which would be like a 350 chevy motor getting @600hp on carbs with good milage and reliability Haven't seen that one yet.
    The biggest and best thing you can do for the bike is to go thru everything on it and make sure it's all set to spec, little things count.
    As for this particular upgrade, it allows you to run a .035" gap on the plugs instead of .026" which gives a cleaner better spark. Most people doing it note that the idle seems smoother, more stable and power seems more even.
    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

  9. #28
    mps5075's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    I also just completed this mod and a complete carb cleaning. Had it out on the road today still with no seat haha.. But I couldn't resist.
    Attached Thumbnails Attached Thumbnails GM Distributorless Coil Mod - Writeup-image.jpg  
    1981 HONDA CM400 CUSTOM BOBBER

  10. #29
    mps5075's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    Not sure why that pic posted upside down
    1981 HONDA CM400 CUSTOM BOBBER

  11. #30
    FastDemise's Avatar
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    Re: GM Disributorless Coil Mod - Writeup

    [attachment=3:3i1tun7y]2013-04-02_18-28-05_817.jpg[/attachment:3i1tun7y]

    [attachment=2:3i1tun7y]2013-04-02_18-33-12_968.jpg[/attachment:3i1tun7y]

    [attachment=1:3i1tun7y]2013-04-02_18-54-29_582.jpg[/attachment:3i1tun7y]

    [attachment=0:3i1tun7y]2013-04-02_18-54-50_889.jpg[/attachment:3i1tun7y]

    Wasn't hard to do and very glad someone posted the idea about mounting flush.
    Attached Thumbnails Attached Thumbnails GM Distributorless Coil Mod - Writeup-2013-04-02_18-28-05_817.jpg   GM Distributorless Coil Mod - Writeup-2013-04-02_18-33-12_968.jpg   GM Distributorless Coil Mod - Writeup-2013-04-02_18-54-29_582.jpg   GM Distributorless Coil Mod - Writeup-2013-04-02_18-54-50_889.jpg  
    ryan.hope likes this.
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