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Old 05-15-2019, 07:08 AM
Dutch Dutch is offline
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Default CDI/ECU measuring scheme?

Hi you all, I am new here form the Netherlands. My 2011 EC300 has no spark at this moment. Measured everything except the CDI. Does anyone know how te measure is and wat the normal Ohm readings are?


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Old 05-15-2019, 02:09 PM
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What are your peak voltage readings for the source and pick up coils (stator)?
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Old 05-16-2019, 09:13 AM
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impulse coil = 99.7 ohm and from source is 14.5 ohm. All wel within the specs. I checked earth, cleaned it all and this is ok, all other wires are checked and ok, ignition coil to sparkplug checked and ok. so my thoughts are CDI but i need resistance figures to check.
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Old 05-16-2019, 10:36 AM
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Not resistance, but peak voltage, measuring what the stator actually outputs voltage wise. Should be at least 4 volts for the pick up and around 100v for the source coil at kicking speeds.
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Old 05-16-2019, 03:05 PM
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Meters are great but not everything can be verified with ohm readings, cdi being one of them, the stator due to failure modes can also pass and yet still be faulty. Try AC volt tests as Nate says. Stators do fail after time. KTM style replacement.
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Old 05-16-2019, 04:54 PM
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+1

Can't really check resistances of transistors and diodes.
Best bet is to swap with a known good CDI module.
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Old 05-17-2019, 10:08 AM
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Thanks for the advice. AC is very low so maybe this is the problem. I noticed that it has been onderwater and a lot of dirt has come between rotor and stator. There is also excessive play on the main bearing so i will take the engine apart first, clean rotor and stator and check again if engine is in one piece again. I will let you know what the results are.
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Old 05-17-2019, 05:04 PM
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They do have quite a lot of play due to the bearing. My freshly rebuilt one scared me.

Electrixworld did a ktm stator which bolted onto my plate fine.
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Old 05-18-2019, 10:43 AM
Neil E. Neil E. is offline
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Can you measure the voltage output of a different bike? A KTM 2T should have similar values to a GG.

I don't know the actual voltages but it's something like: the single wnding puts out 30 volts to the CDI. The CDI puts out 300 volts to the coil. The coil puts out 30,000 volts to the spark plug.
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Old 05-18-2019, 03:32 PM
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If memory serves me correctly.

The CDI runs off 12v.
The CDI grounds the power to the coil, which collapses the electrical field in the coil.
Whatever voltage is required for the spark to jump the plug gap, that's the voltage the coil puts out.
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