Grease nipples on the ends of the swingarm pivot bolt are stock, all 650s have them. That tab under the nut is a locking tab. The small hole in it off to the side should be fitted on a peg on the frame to keep it from rotating when the nut is tightened. Once the nut is tight, you're supposed to bend the tab up against the side of it, much like the folding lock washer on your countershaft sprocket. But, someone has put a washer under your nut. That shouldn't be there and will prevent you from folding the lock tab up against the nut.
Here you can see the lock plate fitted on my '78 Standard, on the lower right. You can see the little hole in the plate fitted onto the peg on the frame. What you can't see is the side of the plate bent up against the nut to lock it down. That's happening on the under side .....
Here you can see the lock plate fitted on my '78 Standard, on the lower right. You can see the little hole in the plate fitted onto the peg on the frame. What you can't see is the side of the plate bent up against the nut to lock it down. That's happening on the under side .....
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