125-200cc Battery/ECU Issues

I bought a 2011 WR125 that has been abused in a previous life, all the road wiring has been removed but not well.

We have fixed all the issues but are struggling with one issue.

With a flat battery the bike starts and runs before cutting out after 2 minutes, with a fully charged battery the bike will not spark at all so it seems the ECU does not like any charge coming from the battery.

The question I have is on some Japanese bikes when the ignition key is turned it steps down the voltage to the ECU/CDI allowing the bike to start, my bike has all the ignition stuff removed....does anyone knows if the WR 125 has a similar system?

Alternatively any ideas what might be up?

Thanks
Chris

Just a theoretical question, with all the road electrics removed is the battery needed.....could the bike be made to work without it, is there anything that would need removing (regulator etc)

Just a theoretical question, with all the road electrics removed is the battery needed.....could the bike be made to work without it, is there anything that would need removing (regulator etc)

a WR 125 does not have a battery...
my 2013 wr came with all the wiring for road registration but not with an ignition key...

Hmmm.....well its definitely a WR according to the chassis number and has a battery recessed into the oil tank.

Luckily last night we found a faulty resistor in the ignition circuit......hoping this has resolved the issue (well fingers crossed anyway)

If you have an oil tank and a battery this bike is not a WR! It should be a WRE125 which is the dual sport version.