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Discussion Starter · #1 ·
I tested my CDI while diagnosing an issue where the engine won't take any throttle (dies) and also dies all by itself at idle after about a minute, maybe less. You can increase RPM via the idle screw but that's it, not the throttle cable which becomes "too much" and dies.

  • coil tests good, spark plug + wire both new
  • voltage at battery is no more than 14 at idle; so the regulator seems good.
  • initially suspected carb, put a kit in it but same issue
  • throttle slider working fine; no known vacuum leaks
  • always restarts and idles then dies maybe a minute later


The image below is from a manual for the KLF220 (Bayou 220, any year.) Notice that even though you're testing for resistance with an ohm meter it's still telling you to pay attention to polarity with the test leads. You can do this with the CDI on the bike but it's less tedious off the bike.



Rectangle Font Parallel Number Slope


My results:

Product Font Material property Rectangle Pattern


The "goes ∞" (i.e. goes to infinity) means I saw a number flash on the meter for a split second and then the display goes open (like if the leads weren't hooked up to anything.) My interpretation of this -- perhaps wrong -- is that's an artifact of using an ohm meter to test a circuit with diodes or whatever in it.

Setting that aside, I still got several reading out of spec, some too low, some too high. The "slow climb" reading are weird. They started slow and climbed up and then stopped. All of this is probably why most people just recommend swapping out the CDI with another "to test."

Can't afford OEM but will report back in about a week after I buy a cheap knockoff CDI.
 

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Discussion Starter · #3 ·
My new $15 CDI from eBay works, but probably also does the original ...

I briefly tested the new CDI before installing it and some numbers are better, some still don't make sense. So in my experience testing with an ohmmeter isn't itself a reliable test.

Long story short, I experienced the same symptoms and basically isolated it to a fuel delivery issue. I connected a temp gas supply to the carb, bypassing the bike's gas tank, fuel cutoff and gas filter and it runs as long as their is gas coming in.
 

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My petcock got corrosion in it and caused strange problems until swapping it out. Some have little filters on the inlet tube that are easily clogged. I remove those filters and install a clear inline filter ahead of the carb.

You might want to replace the fuel line while you are at it.
 
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