I have two WR250R's and I noticed on my 2010 model the engine fault light was staying on and occasionally the bike would not start (no electrical lights, nothing, dead) but would bump start and then be ok for a while but the fault light remained.
Now I thought it might be a faulty rectifier or a loose wire from where I had stripped the bike of all the AIS and EXUP crap. Having a second bike to swap stuff around on, the last thing I changed over was simply swapping out the ECU from each WRR. Bang, the fault light now shows up on the 2008 WR.
Lucky I have a good dealer, I phoned him, explained I had done his job for him and that I had a faulty ECU. He is ordering one in under warranty.
Something else, I asked him how much a new fuel pump might be (here in Australia) and it is well over $600.00. Did I read they are only $275.00 in the US??
Anyone else had a faulty ECU?
Cheers