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Your looking at the 4 wire, square plug, right.

White/red to white/green is pick up coil 459-561 ohms.

Red to white/blue is kind of like the source coil .083-.101 ohms.

Source coil is replaced with a charging/rotation direction coil. It's used to limit rpm in reverse. And the cdi uses it for confirmation on engine speed.

And stator wires are .51-.63 ohms.

Took me a while to find the specs on the newer year yfm350.
 

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If nothing says yamaha on it, the vin isn't correct, you could have a Chinese copy. Plenty of them were made(that I have seen).

Back to the issue, sounds like your cdi is bad. If it has a safety relay, you might have a bad clutch, neutral, or reverse switch. If it has a clutch switch, make sure it's working. It should start pulling in the clutch(if the switch works).
 

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The safety relay would open or close under different feedback.

If the reverse was engaged, or neutral was off, you'd get one result.

If the reverse was off, neutral was on, or clutch switch on, you'd get another.

I'd think if the reverse switches were open, and neutral was on, it should work. Or, if the clutch switch was on(bypassing the other signals), it should work.
 
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