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Recognize these Coils?

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    Recognize these Coils?

    My 78 GS1000 came with these coils on it from when it was converted to a race bike when new. Does anybody recognize these (believe they are Harleys but can't find match)



    They are mounted under the SEAT not the tank and have screw in type wire leads.

    ANother question...... When I measure the power wire to the coils WITHOUT CONNECTING to coil, they measure extremely close to battery voltage. But when I hook wire to the coil, voltage drops 1.5-2.0 volts. Is this normal? There is also a power line split off from the same power source as the coils and leads to I believe is an igniter (is that correct?). If I undo that wire, there voltage remains at battery voltage even when hooked up to coils. What is all this telling me?

    Primary resistance =4.0 Secondary resistance =12K. These measurements are consistent with both coils. I know these are different than stock coils, but will it impact performance.

    Care for another question? I also run DYNA S. One of the magnets under the pickups is split in half but remains intact. Will this effect Dyna output to coils?

    Sorry if I haven't explained myself so please let me know if you need further info. Thanks for your help.

    #2
    Those look cool!
    Are you losing voltage with the spark plugs installed and wired in?
    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
    1985 GS1150ES stock with 85 Red E bodywork.

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      #3
      The voltage loss is due to the fact that the coils are powered ALL the time.
      These systems use "hot" coil loops which are broken to produce the spark - this is also consistent with voltage increase if you disconnect the ignitor.


      I think.
      Someone better?

      -blo

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        #4
        only harleys would have chrome coils...:grin:

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