The chain side bushing in my swingarm was so shot that it actually trashed the swingarm. The hole isn’t round anymore, it’s oblong. This is a pic of a good used one I picked up. I noticed that there is a needle bearing type bushing on the outer side on each side, and a plastic bushing on the inner side on each side. I would think it would be a lot more robust to replace the plastic bushings with the roller bearing type bushings. Has anyone done this?
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You Can double the bearings if you want, but they aren't needed, the bushings work well.
At some point the swingarm bolt came loose, and/or the bearing(s) started to fail...then wallowed out the hole in the swingarm.
I have seen this quite a few times over the years too, it's not uncommon.
You just have to check for slack to prevent it from happening.
And, for coating your frame, the Only way to do the inside is to submerge it in paint, the way many new cars are painted.
But, I wouldn't worry about it.
Unless you drive in deep mud, never wash it off, and leave it outside, you'll never have a problem.
You can also do a great job on a frame with just spray cans, powder coat is great, but not a need.
Clean and prep the frame well, and spray several coats of primer, then multiple coats of paint, over a couple weeks of paint, dry, cure, repeat.
I've done several frames this way.
I dropped a wrench on the last one, and it dented the paint...but it did not chip.