spark plug - whats the difference?

Plug lead looks great. Should check if it arcs to the block to comfirm.
Fuel OK. The fuel runs out of the tap well.
Turns over great. Float charging the battery between attempts.
Wires under seat are like new. Kill switch off.
Compression feels present.
No insect infestations.
I was careful not to flood the carb. However i have no experience with this choke and my sister could not remember where it should be positioned (or the kill switch): I had it in pulled out slightly.
I'll have a look for that users manual now.
Hope it's as much fun after I get it running!

In my CF Moto 500 EFI engine, i run with an Iridiun Spark plug made by Denso.
It runs very good and the spark has a very big light....yes, i put it out from the Cylinder to see it.

No spark after all. Original plug, once removed with 11/16" was in perfect order.
Traced power back along circuit and seems that the spark plug lead+coil pack combo is where the problem is. Kinlon part number #27092.
Could possibly be the "ignitor" part no #27101, will need to establish that next time.