So I have a 1999 Honda CBR 600 f4 with a no spark condition, I have replaced all ignition coils ,three pulse generator's,two icm's. I am totally lost with it I have removed the harness and tested all connecters and all check out, all grounds are good the icm is getting 12volts, I have replaced the zener diode with a voltage converter 12v to 9v I have removed the kickstand switch but did test ok before I have tested neutral switch and clutch switch also. Throttle sensor is working, engine stop switch and ignition switch it working also. All ignition system components have good ground and power. Everything seems to be working but still no spark, and help is greatly appreciated.

 

So it's an F4i, not an F4 correct? Maybe post the model code of the VIN sticker so we can be sure.

From that we can find the correct wiring diagram.

What else have you done? I ask because a couple of years ago someone had a similar problem and after about three months of discussion they mentioned they only had the motor, and it was fitted in a gokart - something they forgot to mention up front (and If I recall, the problem was the tip-over sensor was missing on the loom).

let's start with the VIN sticker details perhaps?

 

Sidestand or Neutral switch..both inhibit the icm module. Have ypu checked both? Mine did same with a faulty sidestand switch...