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The answer is no.
In my experience no matter if the bearings are cheap Chinese or the finest precision American or German, they will fail prematurely when subjected to water and sand/mud. It doesn't matter how well they are sealed. It will get in, and it will destroy them.
The grease they use at the factory is of the brown, cloudy looking type. This is the low end general purpose stuff and gets hard quickly. Your swingarm pivot will be the first to go as it's the least sealed. Followed by the wheels, then the head bearing but not always in that order.
You wouldn't be wasting your time by getting that stuff out of there and repacking with a quality grease like Lucas Red n' Tacky or some other good marine grade grease.
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