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El electrical problem
https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=4377
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Author:  brat [ Wed Oct 01, 2014 6:41 am ]
Post subject:  El electrical problem

My CR125(CDI) has an electrical problem. I have a very weak spark at the plug(new) but I cannot find voltage anywhere else? Should I get a reading on something coming out of the mag? I have changed the stator, too? HELP!

Author:  brat [ Wed Oct 01, 2014 2:55 pm ]
Post subject:  Re: El electrical problem

I finally got the El to hit & start but it takes full throttle with choke on for it to barely run. Turn the choke off & it dies. I have cleaned the carb several times. Any ideas?

Author:  alan [ Sun Oct 12, 2014 6:16 pm ]
Post subject:  Re: El electrical problem

If you have weak spark, the CDI is bad. But it sounds like an air leak, from the manifold or bad crank seals.

alan

Author:  rayivers [ Sun Oct 12, 2014 7:17 pm ]
Post subject:  Re: El electrical problem

Here are readings I took off one of my CR125M ignition setups:

CR125M Ignition Readings (requires high-quality meter)

Stator Output @ 140VAC (narrow pulse - use peak-hold function)
Stator Pulse (trigger) @ 60VAC (narrow pulse - use peak-hold function)
Stator Output Coil Resistance @ 270 ohms (inductive)
Stator Pulse Coil Resistance @ 130 ohms (inductive)
Ignition Coil Input Resistance @ .7 ohms
Ignition Coil Output Resistance @ 10,600 ohms (inductive)
CDI Box Input Resistance @ 4.1 megohms
CDI Box Output Resistance @ 2.6 megohms

Do you have another working carb you can swap out?

Ray

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