Just bought a new CDI with the hope of sorting out my front cylinder misfire

Part arived yesterday and it doesn't match any of the numbers in the Parts Manual

Can any one help? The part number is 30400-KV3-702

I'm going to investigate the wiring to the ignition pickups when I get "clearance" to the garage

My MC18 is a 2J

If the offending item is an MC16 or not suitable, it's for sale. I paid £120

P.S. it's not plugs, coils, carbs, top-end. They've all been done