Hi , names Lucas, I own A CRM250 AR Hoping to get some info on CDI

Welcome. AR CDIs are notorious for going wrong. Main reason is that the reg/rec is on the blink. Sometimes the servo motor is to blame but they are like sheep - They live to die.

Take a look in the FAQs - viewtopic.php?f=20&t=5263

Thankyou,
It has no spark at all I have tried to do a process of elimination, Checked Coil - Re/rec resistance with multi meter. Is there a post i could check what readings im looking for ? Also about to check Killswitch i understand you can bridge it to be sure its not that ? (spark plug is new... was fouling plugs before i lost spark) Would the servo motor make it not want to spark at all... is it that quick to kill the cdi, was running fine then blew alot of smoke and then wont fire at all. Hope that all makes sense. Lucas

There is an AR manual in English. Try looking in the FAQs ...............

manual in my Dropbox here https://www.dropbox.com/s/1vntxlr8ke60h ... R.zip?dl=0