Not sure what the problem is, ignition coil?
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  1. #1
    Senior Member tv219's Avatar
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    Not sure what the problem is, ignition coil?

    Alright everyone I'm coming down to the end of the rebuild. Bike just came back from my buddies who gave the tank and panels a new paint job. I really like the look. However here is my current problem.

    During the the engine installation I damaged one of the spark plugs wires. I cut it in half. FML. I tried to solder them back together but I'm not sure if that helped. I ran the bike for a few minutes and it smoked. It was a white smoke. I thought maybe it was burning oil. So I ran it another minute or two. I pull the plugs and notice one spark plugs is burnt on the bottom. I swap the plugs and the problem is the same on the original side./new plug.

    If I pull the plugs and ground them to the frame the one side, without the issue, has a big deep blue spark where the other side, problem side has a barely noticeable small blue spark. Barely. What else should I be looking for? It's so close and I'm concerned I might have damaged it.
    Attached Thumbnails Attached Thumbnails Not sure what the problem is, ignition coil?-20190819_155634_1566245560550.jpg   Not sure what the problem is, ignition coil?-20190816_145729_1566245582813.jpg  
    Tom

  2. #2
    Super Moderator J-T's Avatar
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    First you need to specify what bike you;'re working on.

    No, soldering the plug wire back together is not the answer. There are legitimate ways to splice plug wires, but, sometimes replacement of the wires or coils and wires is the best answer.
    JT
    81 CM400T

  3. #3
    Senior Member tv219's Avatar
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    It's a 1980 cm400e. I was hoping to just get it running and replace the wires during the winter but I'm not sure if that's the case here.
    Tom

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  5. #4
    Super Moderator longdistancerider's Avatar
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    Plug wires are integral to the coil, not replaceable.
    Proper repair for the damaged wire would be this piece https://www.amazon.com/NGK-J-1-Racin.../dp/B0018JXIXI
    If the weak spark is on the repaired wire side then your repair is bad.
    These coils fire both plugs at the same time so you should have equal spark on both. Check the plug end cap resistance, 5K ohms is spec.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 nuts and bolts restore in progress


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