I took another look at the circuit diagram for the WR and took a look at the one for the YZ. The neutral switch does indeed close 2 circuits on the WR. One is to prevent using the e-start if it is in gear and you dont have the clutch pulled in, The other grounds the "sky blue" wire, same as with the yz. I will have to take your word for what this wire does as I dont yet have a WR to play with but I am sure you are correct and it has the same function as in the YZ. But... the blue/white wire circuit is only closed when you push the e-start button. I also looked at the wiring diagram for the 03 and it is EXACTLY the same as far as starting the bike goes although this doesnt mean the effect of the circuit closing is the same. But I have a hard time seeing how a backfire would strip out the starter gear. Among the reasons is that a backfire is simply the flame front traveling out the intake tract. This can happen when timing is too far advanced but it appears timing is only retarded when the bike is in neutral. So, if you start your bike in gear with the clutch in you are still "risking" backfire.