1973 Z50 Stator Question

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1973 Z50 Stator Question

This is a discussion on 1973 Z50 Stator Question within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; Hey guys...quick question. I recently bought a 1973 Z50 (K4) and have been working on it. I noticed that it has three wires coming out ...

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    1973 Z50 Stator Question

    Hey guys...quick question. I recently bought a 1973 Z50 (K4) and have been working on it. I noticed that it has three wires coming out of the alternator instead of the 4 it is supposed to have. The K4 did not have a battery and the wire harness only has two wires, black to the coil and red to the light switch. The other two wires from the alternator dead end in the connector. The three wire setup seems to be from an earlier model that ran a battery. All that being said, it seems that on the three wire setup the black is still the coil wire. If I am just looking to get spark can I just jump the black wire from the alternator to the black wire on my harness and be good?

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    Yes, you should be able to use the black wire from the K0-K2 stator to the black wire in your harness to check for spark.
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    THanks for the confirmation.

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    One more question that may be obvious, but I've dealt with electrical gremlins before so I just want to be sure. I have power at the black wire on the alternator. I jumped that wire to the black wire on my harness. I now have power on the black wire going to the kill switch and power at the black wire that the coil plugs into. I lose power at the coil wire when I turn the switch to off which is good. So my harness is energized, but I have no spark. I'm assuming that the only thing it could be at this point is a bad coil. Am I correct to assume that? Could there be any other issues?

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    You might want to try removing the spark plug boot and then cut back 1/4" of the outer insulation to get to new wires, and then re-test for spark, your plug boot may be bad. If you still have no spark, then I'd say it is a bad coil.
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    Did you check, clean, gap, the points??

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    I did check the gap. One thing I remember from my 175 is that the points created a spark when they opened. I'm assuming this bike should do that as well.

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    Thinking through this more.....any help is appreciated. So I know I have voltage going into the coil but no spark. I tested resistance across the coil and get close to 17,000 ohms which I think is fine. What else could be wrong? Points, condenser? Would I even be getting voltage if either one of those was bad?

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    If you're getting spark (even a weak one) to the ignition coil, but no spark at the plug boot, it is still leading me to believe it is the coil. Did you try holding the exposed plug wire end to the engine and hand kicking it over, for spark?
    - dirtbkr188 -



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