CD-13 ignition arc

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This topic contains 12 replies, has 8 voices, and was last updated by Avatar theodore 4 years, 3 months ago.

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    joshadurham

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    #1706

    Got my CD-13 all back together today with all new points, condensers, plug wires, and coils. it started right up, but pretty wuickly began arcing inside the magneto. I took the flywheel off and found one of the green wires from one of the coils had been rubbed a bit, and some bare wire was exposed. I put some shrink wrap over the bare wire and tucked it back under the coil away from anything moving better. assembled and fired it up, and it still arced. I can hear it arc, and it misses every time it arcs, and wont run good at all. Did I put something back together wrong? will it still arc through the shrink wrap?

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    chris-p
    Canada Member - 1 Year
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    #17775

    Run her at night to determine where the arc is coming from? Maybe a plug wire as well.

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    joshadurham

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    #17776

    Yea I guess nothing is impossible. But the plug wires are brand new.

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    fleetwin
    US Member - 2 Years
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    #17779

    Yeah, sure sounds like a plug wire/coil is arcing to the plate. Run the engine at night, maybe you will be able to see the arcing if it is occurring on the bottom of the mag plate.

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    joshadurham

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    #17780

    would that bare rubbed green wire from the coil keep arcing through my shrink wrap, or is it probably arcing somewhere else as well?

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    chinewalker
    US Member - 1 Year
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    #17782

    Did you install the rubber sleeves where the plug wires enter the coils? Are you using solid core wires?

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    joshadurham

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    #17789

    Yes on the sleeves, and I got the plug wire from antique outboard. Solid core with new plug boots.

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    joshadurham

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    #17793

    Test ran it tonight. Still arcing and missing every time it arcs, but never saw a spark in the dark at any point on the plug wires. I can hear it in the magneto. I pulled the flywheel and everything looked normal.

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    ddwilson
    US Member - 2 Years
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    #17797

    might double check all the connections including the spark plug wires. Also check the points and see if they look burned could be even with new condensers could be one of them is bad and the arc is the points opening.

    Doug

    how is it motors multiply when the garage lights get
    turned off?

    Mumbles
    Mumbles
    Canada Member - 2 Years
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    #17801

    What brand of coils did you install? The green German Prufrex and black OMC/BRP ones are pretty much bullet proof but there are questionable Asian made knock-offs on the market now.

    If your wiring is good, remove the coils again and look at the bottom of them. An audible high voltage leak will leave a small black mark about the size of a pin head. Even though the coils are new, the insulation may be faulty.

    To firmly connect the spark plug wires to the OMC/BRP coils, they push straight in. A little bit of silicone spray (rubber lubricant) helps them slide in. The pin on the Prufrex coils is usually threaded and the wires have to be screwed in.

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    legendre

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    #17871

    @josh

    Yes, it’s possible to arc through a piece of heat-shrink – but not real likely. The voltages are in the 300-400V range (roughly), which should be OK with heat-shrink for a while, at least.

    I’m also a bit surprised that you can hear a little low-energy spark jump over the noise of the motor & exhaust. Are you certain you’re hearing an arc, and not some mechanical collision that’s impairing the ignition?

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    joshadurham

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    #17876

    Well my best guess is that it’s an arc. It sounds like a small tick noise, and the motor stumbles every time it ticks.

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    theodore

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    #17877

    I would think if you had a Stevens analyzer, you could hook it up to the engines magneto and run a coil test with the flywheel off. Would be easy to see/hear the arcing.

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