Ignition Diagnosis for CB/CM 400/450 and CB450SC manual trans 1978-1986 - Page 8
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Thread: Ignition Diagnosis for CB/CM 400/450 and CB450SC manual trans 1978-1986

  1. #71
    Super Moderator longdistancerider's Avatar
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    Use a 75/115 or 118 combo
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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  2. #72
    Junior Member thunderskah's Avatar
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    I’ve done the checklist, is there a pic of the pickup coil can’t find the wires. Also, if something is out of tolerance does it require a new part? Details are in my project log
    1980 CM400T
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  3. #73
    Supporting Member crazypj's Avatar
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    Pickup coil is little 'black box' under generator cover. The low speed trigger was a failure point and prevented bike starting. It would run above 4K but if stopped wouldn't re-start. If any resistance measurement is within +/-20% of published spec it's good. You would need exact same meter as was used in 1978 to get within 5%
    thunderskah likes this.
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  5. #74
    Super Moderator longdistancerider's Avatar
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    Added pictures to your Project Log
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


    https://www.hondatwins.net/forums/22...d-attempt.html and https://www.hondatwins.net/forums/1-...r-attempt.html
    Road Trip https://www.hondatwins.net/forums/11...here-i-go.html or "where's Jim now?"
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  6. #75
    Supporting Member wv81's Avatar
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    Trying my figure out my issues on my 450 swapped cm400 16f 35r 130/90 rear.

    Low speed steady throttle it feels like it misses every now and then. Then cruising at lets say 65 (4863 rpm according to gear commander)in 6th going up a mountain it does fine till about 3/4 throttle. Then feels like it looses power at full throttle. Back under 3/4 and the power comes back. Down shift into 5th and I can bury the 85mph speedo.

    I tried to to test the stator and I after I unplugged the wires I didn’t see a brown wire but two pink wires. So I tested like this. https://imgur.com/a/k179hb1

    my coil was 1.4 my caps were right at 5k
    Last edited by wv81; 07-11-2019 at 08:13 AM.

  7. #76
    Super Moderator J-T's Avatar
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    Sounds like it's running normally. 5000 rpm is low on the power curve and your 6th gear (overdrive) is intended for cruising in the flatlands, not climbing mountains.

    You would be better served by starting your own topic in the appropriate section to ask your questions, that would provide better visibility among those best equipped to help you.
    JT
    81 CM400T Under re-construction
    82 GL500

  8. #77
    Super Moderator longdistancerider's Avatar
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    Quote Originally Posted by wv81 View Post
    I tried to to test the stator and I after I unplugged the wires I didn’t see a brown wire but two pink wires. So I tested like this. https://imgur.com/a/k179hb1

    my coil was 1.4 my caps were right at 5k
    Your coil is too high Primary resistance, under 1 ohm is needed. .55 ohm is the latest spec. Too high of resistance places more load on the CDI unit causing premature failure plus weaker spark.
    Here's a picture of that connector showing the color code positions
    Ignition Diagnosis for CB/CM 400/450 and CB450SC manual trans 1978-1986-201_4136.jpg
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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

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