As said above, check the head steady bolts and tie bars. I've cracked/worn out several of these as well. Also, if the aluminum mounting plates that swing out when the swingarm bolt is removed are worn out, no amount of tightening is going to solve this problem. I have had to replace a few of these over the years and also had to put shims in when the engine cases got wear at the bosses as well.
Once that lump starts vibrating and moving around in the frame like that, things wear out quick. One hour into a three hour enduro several years ago, my engine started vibrating and making a racket, figured crank was going and keep racing. By the end of the race I had worn a hole through the cases from the movement, trans oil leaking everywhere. Now I routinely check all related engine mount/suspension bolts. Saves a lot of headache later.
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