The answer your question, the tach does not sweep when hitting the kill switch and within half a second turning it back to run, fuel pump primes but tach does not do a sweepI think he had a fan going in the garage(that's what I was referring to), in the first videos, so i couldn't hear the fuel pump.
The fuel pump and STVA re-prime after the stall, but the tach doesn't. Could that be a clue?
If you shut the running engine off using the kill switch(not key switch) and turn back on quick(within half a second, don't wait 3 seconds), does it do a sweep? I know I asked this before, but just checking.
I've never heard of a TOS going bad. But if you can locate it, take it off it's bracket and till to +45deg. Does it stall the bike? Does it throw an "FI"? Does it reset on it's own, or do you have to toggle the ignition switch?
Do the kill switch test first, and the TOS second.