thump under left foot

[RX-1MAN]

A couple years ago I was feeling a slowing to a stop thump. Turned out the jack shaft bearing lock nut had backed off and was flopping around on the shaft.
This time however the cause was a missing shoe ramp(black slider) in secondary clutch.

 

[gofast]

well i got around to changing the bearing, and the thump is no longer there, although the bearing does not feel bad in my hand spinning it, i'm still not sure it was a bearing or something else i touched when swapping it out.