Spun bearing too. But before you crack into the motor I would check the cam chain tentioner. Mine was bad and it sounded like it had no oil and the valves were loose and flopping around. I pulled the tentioner out and reset the ratchet thing to zero. Stretched out that spring about 1/2 inch and reinstalled it. First fire up it clicked a few times while it put tention on the chain and then went away completely. Hasn't come back in over 500 miles. I think that noise was so bad that is why the previous owner sold it. But it was an easy fix that didn't cost anything in new parts. Just some time. I have video of before and after. But I have yet to upload it anywhere.