Starting problem theory.

[noggythenog]

Noggy, it could be the ignition switch which has 2 wires that supply an earth to the ECU, without this earth the ECU will not work. The earth is taken from the neutral switch and/or the side stand switch up through the ignition switch and back to the ECU..
The fact the engine turns over on the starter rules out the side stand switch as it also supplies the earth for the starter circuit.

A few questions to narrow it down

Does it happen with the bike in neutral?
Does the neutral light work?
Does the neutral light still work, when this happens?
Does it happen with the bike in gear side stand up and the clutch pulled in?

Check the wiring from the ignition switch to ensure there is no corrosion in the plug under the tank. It does not take much corrosion to cause the problem. Has anyone on the forum taken one of these switches apart? (I have not seen the inside of one) as it may have a resistor like the Suzukis have to prevent hot wiring. If not you could bypass it the next time it happens and if it starts change the switch.
How proficient are you in using a meter? you could test the wires of this circuit to ensure good continuity.

Interesting thoughts unfazed.....to answer some of the fault find questions:-


- it happens with the bike in Neutral


- the neutral light works well


- neutral light still works at times that it acts up


- so far, clutch in & she starts, although ive only been trying it with the clutch pulled in since getting it on the road but she has without fail started up whilst also pulling the clutch in....my plan is to continue this method a little longer to get more of a spread of succesful attempts but tbh it would have usualy failed a few times within the alrady tried starts......p.s - side stand up or down she still starts with clutch pulled in.




There were a couple of connectors under the tank at the front end that i just couldnt get to, near the CDI they were...i tried and tried but there was no purchase as the wires they were connected to were too tought to pull out to a useful degree to get my fat fingers in there.