Engine won't start

If its stock jetting it might be so rich it doesnt start with choke. I had a carby where chocke was so loose that it would move to ON position on its own. Make sure its not moving on its own. Check if plug is wet or dry after trying to start it. If its wet then its not fuel issue most likely and probably issue with ignition. Also had one of the stock cdis that couldnt produce spark under compression. When sparkplug was off it was sparking but looked a bit weak.
 
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