I wish to start out by thanking all contributors to this forum for the knowledge I have gleaned in a short amount of time.
Ok, getting to grips with new 2000 blackbird.
This first time I rode for at least 30 miles the FI light came on. It was a code 25. Bike ran normally, but on subsequent rides FI light would come on sooner, after 10 miles, then 5.
Bike continued to operate with no other hiccups other than the FI light. (Code 25 is for knock sensor.)
According to all accounts there is no fix for code 25 except a new ECU!
Nevertheless, I did the loom fix, some of the green wires were a little crusty looking. All soldered up ok though.
Also, I added additional grounds at the headlight end of the loom to the high beam, low beam and horn circuits, and put the low beam and horn on relays to take stress off the loom, which apparently is fairly fragile.
Bike continued to run well but FI light returned after a couple of 30 mile runs. Once on, the light would reappear on the same day after a restart as soon as 3000 rpm was hit. Again no running issues were noted.
Checked continuity of knock sensor wire. Check OK.
Running out of options I decided to run bike with knock sensor wire disconnected. FI light came on as soon as 3000 rpm was reached.
Returned home and reconnected knock sensor wire, and went for a ride. No FI light on that ride, or any ride since. 4 tanks worth including 30, 50, 100 mile rides.
..............Now that I have opened my big mouth, I expect murphy's law will kick in and show who the real idiot is.