That's what's good about having two bikes, you can quickly swap parts between them and confirm if the part is the problem or not .
I run into this at work quite often, a problem is troubleshot to 'death' and no solution can be found .
You need to step back from the 'situation' and go through the steps that were taken, usually the problem gets over complicated in the troubleshooting process .
While I was attending aircraft mechanics school in the early '70's, I had an instructor that brought this theory up and I use it all the time .
Occam's Razor, simply put, all things being equal, the solution with the fewest assumptions is the most correct .
It has rarely led me down the wrong path in 36 years of working on aircraft and motorcycles.
