Usually you replace them in sets because they get worn together. I've replaced bushings on Yamahas and Suzukis and it looks like they're the same on the Predator. Pull out the old ones and install the new ones.
Bushings can be a little tough to get in and out, so don't be surprised if you need a hammer and a flat punch to remove them. When you install new bushings, lube them up a little bit and carefully press them in with a C-clamp. Don't hammer on your new bushings unless you're lightly tapping them. If they're real difficult to install, put them in the freezer so they contract a little bit.
A diagram of the Predator doesn't show any seals, so all you'll have to replace are the bushings. There's also little sleeves in there, but you won't have to replace them.
Look for an aftermarket company like "Pivotworks" to sell all 16 bushings significantly cheaper than OEM.
Some companies offer bearings to replace the bushings. I suspect bearings will need a lot more maintenance to prevent them from rusting and I would just use bushings.
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2004 Yamaha YFZ450
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