'05 gearbox issues / hard to shift
 

Hello! The gearbox of my '05 has some quirks. I bought it like this, so I'm not sure if it has been driven hard of have some damage. It sometimes is very difficult to get it into gear when I'm standing still. If it happens, I need to release a little bit clutch to line up the gears (i guess). Also, when I go from neutral to first, it "dangs" quite loudly (especially when it's cold and the choke have rev'ed it up a bit) and I feel a heavy jump in the bike (it doesn't move I think, but it sort of shakes). Also, the shift lever doesn't feel so smooth on the foot when I go between gears.
I have a '99 600F4 which is much smoother.
Anyone knows what could be the issue?