So what did I break this time?!
I previously found that having a random piece of carboard taped over the air box made things run but removing it caused the engine to bog down and die. I finally got around to doing the air/fuel adjustment yesterday and appear to have cocked something up
It's a CBR900RR in a kit car and, after a bunch of reading, it looked like I could wind each mixture adjustment screw gently to it's stop then out 2.5 turns. I did this and went for a drive, all was well.
After about 10 minutes, on the way home, the engine died. The fuel filter was empty so I think it did genuinely run out of fuel. 2x5L cans later and it fired up but wouldn't allow anything more than about 1500 RPM. I limped home and tested the fuel pump, all fine and pumping well. I re-set each adjuster to 2.5 turns, no change. I tried 3 turns, no change.
I removed each adjuster completely, all looked fairly clean, popped it all back together and now it's popping and banging and over revving but still won't take any load from the throttle.
Although I thought I was gentle seating each screw, my only guess is that I damaged something doing that but was after any thoughts/suggestions