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| CR125 CDI Voltage https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=359 |
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| Author: | Guest [ Fri Sep 03, 2004 8:05 pm ] |
| Post subject: | CR125 CDI Voltage |
Does anyone know how much voltage, (DC) should come from the CDI unit to the coil when it is kicked over? I am reading about 3 volts, which seems a bit low for the coil to step it up. The stator seems to be pushing plenty of AC up, so is my CDI DOA? |
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| Author: | ricortes [ Sat Sep 04, 2004 8:52 am ] |
| Post subject: | |
Did you use an oscilliscope to measure the 3V? I don't have a CDI in my Honda, just points/coil. I do have several bikes with CDI and it is more like a ~200V zap to the coil then a sustained voltage. If you measure the coils primary and secondary resistance I can do one of mine for comparison. Just drifting a bit. I looked up CDI in the US Patent base. They are a relatively simple design in their lowest common denominator. Just some AC to DC retification, a sensistive gate SCR<similar to the silicon found in light dimmers> and the equivalent of a photo flash capacitor. I ended up making my own albeit w/o any advance or other nicities for a Suzuki. |
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| Author: | Thor [ Sat Sep 04, 2004 11:38 am ] |
| Post subject: | CDI |
I just used the old Radio Shack special voltmeter to check if there was any juice there. I am going to pull a CDI from one of my other CR's to see if it helps, possibly a coil also. Thanks for your input! |
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| Author: | Thor [ Sat Sep 04, 2004 2:53 pm ] |
| Post subject: | CDI |
Yup! Bad CDI. I stuck another one in from one of my running bikes, and low and behold plenty of spark. Thanks! |
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