Still trying to find the cause of this. Cleaned the kill switch again today and noticed the two Red/White wires were not red white wires at the plastic plug. Another connector and had been used and the kill switch wires soldered to it. I cut and bullet crimped but alas...still cutting out over bumps. Not every bump now I may add.

I notice in the wiring diag the ignition pulse generator and cam pulse generator share a common ground. Going to look at this tomorrow and try and source new relays.

Phew...

 

Update on the cutting out.

I replaced the fuel cut out and engine stop relays with new Omron ones. I couldn't find the original ones but was recommended a place to try and right enough they fitted.

I took the bike out for a ride that has bumpy, uneven roads and it didn't cut out. I had previously put the main beam relay as a trial in these locations and it still cut out. The jury is still out whether it's fixed or not. Unfortunately I got a puncture coming Home yesterday. My local tyre place closed on a Sunday so I wont be able to try it until tomorrow.

I also shorted the service connector to check for fault codes from the MIL. There were none.

 

The ignition switch on my CBR900 used to do that occasionally, not regularly like yours does, but eventually becoming annoying enough for me to replace it, which solved the problem.

 

I suppose you could test that by jumpering the ignition switch. I haven’t got a diagram for the 929 but I guess if you unplugged the connector to the ignition switch which, which is probably somewhere beside the fuse box and, with a piece of wire, short
FAN – IG – BAT1 (or just IG – BAT1).

And then ride over a bump or 2.

You can of course stop the motor with the kill switch, but leave the connection exposed so that you can easily disconnect it.

 

That won't work on a 929. The switch has a diode in it that needs to hooked up to energize the ecu.

 

Oh, it’s got an immobiliser diode so you would have to get an appropriate diode and solder it onto your jumper as well which is sounding a bit complicated now.

 

Correct. On the pink wire. Holding a steady input to the ECM.

I'm happy to say the cutting out over bumps is fixed. It was a relay. Just goes to show they passed the workshop manual bench tests but in real life road conditions, failed with shock and or vibration.

Thanks for everybody's help and input.