gearbox death rattle

today I messed up a couple of gear changes and started to noticed a kind of clicking/rattling noise when in neutral when stopping at lights. A few miles later, riding along in 5th at 70, I started to lose a lot of power, almost like my clutch was completely slipping, so I dropped to 4th and it was ok again, checked 5th but it did the same thing. slowed down at lights and as I tried going into 2nd and first, the gears were grinding/rattling when changing and after selected, even neutral was chattering whilst stopped.



came off the road and even neutral with the clutch disengaged was rattling, 1st and 2nd both were rattling like mad, but still worked okay... 3rd and 4th didn't seem to make any noise and were responding pretty much normally. 5th was still dodgy, with very little power. rode home almost completely in 3rd gear, with some coasting in neutral, trying to avoid 1st and 2nd at all costs lest my box should lock up



I guess it's something got to do with either the selector drum, selector fork, the dogs on 1st/2nd, input shaft bearings and generally the clutch.



Obviously I need to strip the engine back down to fix the thing, but wondered if anyone experienced something like this rattle in 1st, 2nd, 5th and even neutral ?



cheers