The gearbox is much better when revs are matched. Blip on downshifts and a touch of clutch going up. It's a shaft so less tolerant of clumsy/slow shifting than a chain drive.
Mine rattles when plugs need renewing. It did the same when coils were failing.
Gearbox rattles in neutral & has for at least 20K miles. I pul the clutch lever to damp the noise. Clutch slave cylinder is still going strong.
It developed an annoying scraping clatter which turned out to be cracked alternator casing. New alternator fitted. Old one was seized solid within a month on the shelf.
With the Givi AF330 screen, tyre noise at 70 is worse than exhaust noise so ear plugs are a must.
Why can't helmets be more effective for stopping noise?