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Aftermarket/replacement ignition coils?

Discussion in 'Suzuki 250cc Twins' started by Johnny, Mar 9, 2014.

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  1. Simon

    Simon Well-Known Member Premium Member Contributing Member

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    Not sure if this is any help..I took a bike in that had been dropped (GJ72a gsxr250) and afterwards wouldn't fire...replaced the damaged bits and still no spark. Substituted known 'good' parts for old and still no luck..eventually got it running with all 'good' known parts..but not right..it would run on the sidestand all day..once put under load the ignition break up was huge..long story short the stator looked the same as in black/burnt even though it tested fine for continuity/earth/ and put out a good 14.8/14.9 v from the rectifier..50-65v at source if memory serves me right at 2-3k rpm..statically the stator tested fine but when running gave out what i'd regard as strange readings..turns out the stator had earthed internally onto the casing..I cant fathom why as the bike was literally undamaged bar a bar end and scuffed lhs magneto cover but long story short the internal earthing prevented the ignition module or CDI from creating a spark in the first place as it shuts itself down to prevent internal damage..the culprit was pretty much a hairline crack in the cover..that might not be what's happening but deffo worth a look as the stator when it grounds changes colour..hope this helps and good luck m8 :)
     
    • Like Like x 1
    Simon, Jul 10, 2014
    #21
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Following on from what Simon said. There's an app for that!
    Ummm not really. A long time ago, when dinosaurs roamed the Earth, I had a piece of electrical equipment that I picked up from an army surplus store in Brisbane for the grand sum of $20. This machine could apply high voltage/low amperage for the purpose of testing insulation (DC as I recall). I always used it for testing motorcycle stators as a static test with an ohm-meter doesn't always find the problem. Those machines have a name, but I can't remember what they are called; Ruckussman might know. Of course the stator has to be mounted in its housing for this test because the current is going to jump to earth as you wind the voltage up. Well that probably isn't really correct as electrons have a negative charge therefore they would be jumping from earth. Anyway the point is that there are people out there who have these things and you just need to find one. Try a good auto electrician.

    cheers
    Blair
     
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    maelstrom, Jul 10, 2014
    #22
  3. Johnny

    Johnny Well-Known Member Premium Member

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    Thank you for the help you've provided, progress at last, the bike runs! Couldn't try it more now than just a km or so, it was really dark already, but it runs. I think it was the connector from the pickup coil wires that was driving us nuts, my cousin solved it, but their were other things also... For now, here's a new mystery: both cylinders are working but noticeable smoke comes from only one pipe, what's going on? Something with fuel mixture? Any ideas what to do? Also, does it matter which way the regulator is placed, the ribs horizontal or up?
     
    Johnny, Aug 30, 2014
    #23
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