So I have a cb400 with just under 10k km on the odo. Picked it it this week and took it for its first proper ride yesterday. Going 80 odd kph and went to change up. Found a false neutral and let clutch out, queue much revving. Unfortunately it then decided to find the next gear with a massive crunch/rattle. I'm assuming I've done some damage, although the bike still rides and changes ok. Pretty sure there was no pressure on the shift linkage when it finally found the gear. Is this a thing that can happen? And if so, should I do anything now to lessen the damage? If the gearbox and engine oil are from a shared sump, should I drain the oil and see if there's any bits of metal in there? As you can probably guess, I'm a bit of a noob and don't want to break a near new bike.