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Discussion Starter · #1 ·
Hi everyone! Had my Formula 3 running pretty good while ago, but a couple of days ago, it wouldn't start. Checked the sparkplugs and they seemed to have spark and it popped like it was trying but didn't start.

So I figured I'd take a look at the CDI box. When I got it out, it didn't look like any wires were damaged.

So I wanted to ask if there was any way to test the CDI box or the stator


Any ideas on what's going on would be appreciated, thanks!
 

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I'm confused. In your subject line you said you have no spark and then in the text you say you do??

No real way to test CDI. You can test the stator using an ohm meter.
 

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I think I'd test the voltage at the stator, should put out between 30 and 45 volts AC. Then test the voltage coming out of the CDI, should be about the same 30-45 volts AC. Then test the voltage at the spark plug cap. Should be around 20,000 to 35,000 volts.

To test. Just put the test leads on the wires and pull the recoil a few times while watching the voltage. note the highest voltage.

But if that scares ya, then just taking an ohm meter to the stator and the coil might give some clues.
 

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Discussion Starter · #5 ·
I think I'd test the voltage at the stator, should put out between 30 and 45 volts AC. Then test the voltage coming out of the CDI, should be about the same 30-45 volts AC. Then test the voltage at the spark plug cap. Should be around 20,000 to 35,000 volts.

To test. Just put the test leads on the wires and pull the recoil a few times while watching the voltage. note the highest voltage.

But if that scares ya, then just taking an ohm meter to the stator and the coil might give some clues.
Alright, thanks. I'll give it a try.
 

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Sounds like a bad CDI, but check connections, specifically the trigger coil
 

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It has a DESS? Interesting. That is another can-o-worms. As the CDI is actually an MPEM
 
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