Hi,
Can anyone tell the firing order from the coils on a CBR400 NC23
I have it as
coil 1 - 1&4
coil 2 - 3&2
is this correct?

Yup that is correct mate.
People get confused because of haynes manual and put them 1-4 2-3 but the way you said is right

Reason I asked I put in a motor last month which came out again.I put in another motor last week but now running with 1-4 3-2, it made it complicated to run the leads. Which I didn't find complicated the first time we put in the motor. Is it the firing order for NC23 K&J models?

Thanks for the response

I did same thing last week took out my engine and put in my spare one and the ht lead on coil 2 seemed shorter and wouldnt reached 2 properly.
Mine is a k and i have always had mine at 1-4 3-2.