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Joe Peters

1988 Yamaha Moto4 YFM350ERU

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I have been in process of restoring my YFM350ERU, now I can not get a spark to my plug. I was told it could possibly be my CDI. it was sparking fine when we rebuilt engine but now I have no spark. is there a way to test the CDI. I have looked for a CDI board on the web but it is NA.. ant help would be greatly appreciated.

thanks JOE

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The cdi boxes are available on eBay. New and used.  I really don’t think it’s your cdi though.  Especially since you said you had spark before the rebuild. So unless you left it out where it was wet and moisture got inside  or burnt it out by hooking something up wrong my guess is it’s prob fine. 

 Have you double checked all of your wiring connections as well as looking for any banged wires that may have happened while putting the motor back in or pinched ? 

Have you tested the stator coil, regulator and secondary coils ? Easy test with an ohm meter.  Double check your kill switch.  

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