In the manual it says the spark plug gap should be 2mm. Can you adjust the gap on these spark plugs like regular piston engine spark plugs?

I just bought some spark plug wires. One pair has #1. The other pair has #2. Am I right in assuming that #1 is for the spark plugs in the front rotor housing? And also, the ignition coil closest to the firewall is only for trailing wires right?

Sorry for the newb questions

 

Just get the NGK BUR9EQs for the trailing, and BUR7EQs for leading.. No gapping required.