check you swing arm bearings. if they are bad it could make the chain misaligned on the sprocket resulting in the "winding" noise you are hearing.
As for the bolts thei should be a 6mm thread with a 1.25 thread pitch
stand up on the pegs and your hands on the handle bars. look at were the swing arm pivots at the frame and shift your weight from left to right. if the bearings are good you will not get any movement left to right at the pivot point. if you do well then you need new bearings lol. hope this helps. ////Love Pease and Axle Grease////
Did getting the new chain roller work? I’m having the same issue, I’ve tightened the chain loosened the chain replace both sprockets and the chain and the noise is still there. Humming buzzing noise from front sprocket