Engine stopped - CDI test ???

Check the CDI with an ohm meter at 20Kohm setting, ground to the plug cap and hot to the black wire should gibe you around 2.3K.

Other than that I have found no other way to test a CDI out of circuit.

Check you connections, and pay attention to the white wire kill button wire as well, disconnect it if in doubt about the throttle kill button.

Check your spark plug, every auto store sells these keychain disc gapers for like a buck at the counter.

Nothing to them really, just a disc with a varying width and numbers.



Most plugs for these bikes work best between .028 and .032 gap depending on your wiring and the plug



The wider you can go and still spark the better, it is a bigger spark arc, but you set it where it will reliably spark all the time.

A good plug certainly helps with getting a wider gap, I run .032 my Iridium NGK.
Then again I also run all new CDI wiring as well ;-}
(no shameless plug this time)

I am having the exact same issue. Duame at DAX said it was more probably my magneto than may CDI so I replaced that. That didn't work so I am getting my new CDI in the mail today. KC, I had read on this site elsewhere to gap it between .24 and .28 so I gapped it at .25. Do I need to go get a gapper ( I used a friends) and bump it up to .30? I have an aftermarket plug and wire.

For ~$1 a gap tool is just a handy thing to have ya know?
And the gap depends on the plug and wiring.
I'd try .028, that should be wide enough.
It's the really good plugs and wiring that let you open them up some more.

I had the same problem. I replaced the plug wire and it ran fine, the wire was broken internally on the CDI side. Ran so well I crashed it, after I recover I will put it back together again.

ferball said:

I had the same problem. I replaced the plug wire and it ran fine, the wire was broken internally on the CDI side. Ran so well I crashed it, after I recover I will put it back together again.

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Ouch! Crashed it?
You going to be OK?
Best wishes dude.

there's a thread here somewhere about plug gaps, and i did some experiments. factory gap is .030 (depending on your manual) so i started there, then went down in increments of .005 (.025, .020, .015 etc...)

at .005 i couldn't start it anymore. went up to .008 and started it, but it took awhile and ran like crap.

went back up to .030, then went up in .005 increments. crapped out again at .050. still ran at .045.

from .020 to .040 their wasn't much of a difference.

i run my bikes at .020. from racing experience, i know a smaller gap is better for higher RPMs, and i run my bikes at WOT all the time, so if it's a little harder to start, i don't care.

KCvale said:

Ouch! Crashed it?
You going to be OK?
Best wishes dude.

Click to expand...

Be fine, just sprained my wrist and elbow, and a few bruises.

ugh, those Chinese plugs are disgusting...