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| Ignition problems https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2573 |
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| Author: | cbly [ Mon Dec 21, 2009 2:25 pm ] |
| Post subject: | Ignition problems |
Doing some experimental stuff with my points ignition system on my 74 cr 250 Elsinore, and think I may of burnt my coil or mag, Can someone tell me what I should read with an Ohm meter when testing the coil and Magneto. I cant seem to find it anywhere on any threads, I have test the out put wireon several different magneto's that I have ( output wire = + / ground wire = -) and two of them zero the meter, and one never moves the meter off of 1.0 . And when I test the coil from gound to positive wire it zero's the meter, then I test positive side to plug wire and it shows about 10 ohms. Any help appreciated, cbly |
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| Author: | rayivers [ Mon Dec 21, 2009 6:19 pm ] |
| Post subject: | Re: Ignition problems |
I recently took some readings on my '74 CR125M ignition components. The stator 'spark' winding and ignition coil readings should be close enough to use. You'll need a good meter - and some unusual settings - to take these readings. I have a Fluke 87 (which I consider a very good meter), and even then I had to pull out the manual to figure out how to set the meter for peak-hold and 1 mS sample time for the voltage readings. It was worth it, though, because voltage readings show actual performance rather than just wire resistance. For the coil input resistance, I shorted the leads and zeroed the meter to remove the lead resistance before taking the reading. At any rate... Ignition coil input resistance (red & green or blue/white & green wires) .7 ohms Ignition coil output resistance (green wire & plug cap) 10,600 ohms (10.6k ohms) Stator coil output resistance (red wire & ground) 275 ohms Stator coil output voltage - approx. 140 to 160 peak AC volts when kicked over rapidly Ray |
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