GM Distributorless Coil Mod - Writeup - Page 14
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  1. #131
    Super Moderator longdistancerider's Avatar
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    The CB750 coil will not work, the coil has to be under 1 ohm of resistance and this one is spec'd at 5 ohms.
    The second one may be ok, no spec listed for the ohms.
    Too high an ohm load will damage the CDI unit.
    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

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  2. #132
    Junior Member Fox&Palmer's Avatar
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    Damn, it looks like the other one is 4 ohms. Alright, autozone it is.
    -Mohinder-
    Fox & Palmer Customs
    "Custom is just another way of saying I've never done it before."


  3. #133
    Junior Member Morse92's Avatar
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    Where do I get the connecter that goes from the coil to the battery cable I've read the comments but I must be missing some terminology or something

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  5. #134
    Super Moderator longdistancerider's Avatar
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    Quote Originally Posted by Morse92 View Post
    Where do I get the connecter that goes from the coil to the battery cable I've read the comments but I must be missing some terminology or something
    The old coil primary wiring gets cut off the coil, then it's soldered into the new coil. Doesn't matter which wire goes to which terminal.
    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?"
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  6. #135
    Junior Member Morse92's Avatar
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    Quote Originally Posted by longdistancerider View Post
    The old coil primary wiring gets cut off the coil, then it's soldered into the new coil. Doesn't matter which wire goes to which terminal.

    Ok I did try to solder it but it didn't seem to want to stick I'll try again thank you

  7. #136
    Junior Member MikesMotovlogs's Avatar
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    I know this is an older thread, but does anybody know if this will work on a '82 CM250C?

  8. #137
    Super Moderator longdistancerider's Avatar
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    Quote Originally Posted by MikesMotovlogs View Post
    I know this is an older thread, but does anybody know if this will work on a '82 CM250C?
    I don't have that manual but in looking at the CB250T the ignition system is the same basic setup as the 400/450 series. Looking at the part number for the coil it is specific to the 1982/83 CM250C. I don't have a resistance spec for your coil.
    My best guess is that this will work fine.
    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?"
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  9. #138
    Member simactive's Avatar
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    Quote Originally Posted by longdistancerider View Post
    I don't have that manual but in looking at the CB250T the ignition system is the same basic setup as the 400/450 series. Looking at the part number for the coil it is specific to the 1982/83 CM250C. I don't have a resistance spec for your coil.
    My best guess is that this will work fine.
    Bike: CM400T 81

    Hey so I HAD a running bike and I figured I would try this mod out. It seems easy enough from what I saw. I ordered the AC Delco D555 replacement part from prime Choice auto. I figured I could install in an afternoon and be done with it. I've been on and off trouble shooting ever since and my bike is now parked it's winter anyways but it screwed me out of the last few months of riding.

    When I measure the 2 posts wher the plug wires go I get about 6.5 kohms from my multimeter. Each wire cap HAD a 5kohm resistor built in but i made it a straight through so the wires now only have about 5.5kohms on each side. Everything is connected properly and since what people said here you do not need to ground the coil (even though the original coil was grounded to the frame) I only connect the two wires to it. I took wires off my old Accord wiring and cut to use.

    SparkplugWire 1: 4 kohms of resistance and Sparkplug wire 2: 6.8 kohms.

    Anyways also when people are talking on here 1ohm resistance on wires or 5 ohms. Are you refering to kohms or just singular unit of ohms?

    I'm getting no spark to the plugs from the coil and nothing has changed from the wiring since I parked her. The only thing different was the coil, I haven't put the original coil back on it see if I could fire her up BUT if this coil resistance was higher or different I'm afraid now i might have burnt the CDI and made a cheap upgrade in to an expensive search for a working CDI. Measuring the CDI my multimeter picks up about 15V on cold cranking.

    Thanks for all the help.

    Cheers

    Pictures below of measurements:
    GM Distributorless Coil Mod - Writeup-img_20170205_152125-1-.jpg
    GM Distributorless Coil Mod - Writeup-img_20170205_152202-1-.jpg
    Last edited by simactive; 02-05-2017 at 01:53 PM.
    1981 CM400T - Tinkering and riding around; More fixing than riding ATM.

  10. #139
    Super Moderator longdistancerider's Avatar
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    I would run an ohm test on the coil primary wiring, should read well under 1 ohm. I suspect that one of the 2 wires isn't making a good connection where they are soldered in
    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

  11. #140
    Member simactive's Avatar
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    Quote Originally Posted by longdistancerider View Post
    I would run an ohm test on the coil primary wiring, should read well under 1 ohm. I suspect that one of the 2 wires isn't making a good connection where they are soldered in
    Hey thanks for the reply,

    When I measure the primary side of the coil it reads under 1 ohm, to a point where my multimeter beeps to tell me there is a short.

    What is the resistance of your sparkplug wires from end to end?

    I'm going to try and hook up my old coil and see if it fires too just to make sure I didn't burn the CDI, but if its pumping out voltages then the CSI shouldn't be burn the right?

    Thanks

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