Clinician
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Joined: Nov 28, 2019 13:55:23 GMT -6
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CDI Help
by: 9091v89 - Nov 28, 2019 14:04:43 GMT -6
Post by 9091v89 on Nov 28, 2019 14:04:43 GMT -6
So, I have a little 50cc engine I've been working on. I made pretty good progress on it so far, and most of the stuff is working properly. It runs fine, but my dad told me I should test the voltage output of the CDI to make sure its working right. How do I go about testing this, and what voltage should it be outputting?
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CDI Help
by: cyborg - Dec 4, 2019 8:19:26 GMT -6
Post by cyborg on Dec 4, 2019 8:19:26 GMT -6
Contact Jim at rapid repair or the tech Lin at parts for scooters
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Clinician
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Post by tomw on Dec 14, 2019 11:22:33 GMT -6
To test the CDI for output, you can readily check that the coil is firing before bothering with the CDI. If you get spark from the coil, the CDI is working.
If no spark after removing the plug and stuffing it into the plug wire, grounding the metal of the plug on the engine and cranking(make sure the kickstand is up as some will kill the spark with kickstand extended), then check the voltage to the coil. The voltage to the coil comes from the stator winding for AC CDI systems. The CDI triggers the coil to fire by removing the voltage. You should measure voltage on each revolution of the crankshaft and flywheel.
No volts may indeed indicate CDI failure, or it could be a failure in the stator CDI voltage winding. There is also a pickup that knows 'F' mark on the flywheel, and fires the coil by triggering the CDI.
A spare CDI is a nice checking tool, but you can diagnose without one.
tom
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