OK, well it will be as you have the plugs in the engine, I'm sorry I was thinking that you had a ZX7, when I saw the fins on the engine, anyway we are OK, you probably were scratching you head when I said remove the lower fairing...lol
Anyway I think I want you to advance to the starter motor, I think we need to check that out, actually to pul the starter motor or get to the wire connection on the starter is fairly easy.
You will need to remove the L/H foot peg and your gear shift lever, then remove the countershaft cover (sprocket cover) once that cover is off you will see the starter motor just above and forward of the front sprocket, then you will see a post with a wire attached to it, get a 10mm wrench and see if that nut on that post is tight, of so then of you can get a jumper battery, take the battery out of the bike, and then carefully get a jumper wire and connect the battery directly to that post, then hook the (-) negative ground jumper to a good clean (not painted part) of the engine, then where all that is hooked up finely touch the jumper (-) negative to the negative post on the battery and see if the engine will turn over ?
So what you are doing is going directly from the battery to the starter motor, by-passing the main harness and the cables for the ground and positive cable to the battery
Let me know if you have any questions