Squawking noise on and off

[His Dudeness]

Well that's ruled out a few things so not a waste of time. Never heard of a squawking clutch but maybe it's possible. Usually when a clutch is going it slips under heavy load. When you give it a lot of throttle the revs shot up but your speed doesn't change much. It's easy to take it apart you just have to be careful when you reassemble it that it's all sitting evenly or you can snap the pressure plate. You could try taking the oil fill cap off an listen does the squawk get louder with the cap off that would be a good indicator that it's coming from the clutch area. You might get a bit of oil spray with the fill cap off.