Micky D reminded me.......
Some bikes (by poor design) have the oil running around the headstock (the F650GS etc)
This cooks the grease out of the bearings. If you're running an F650GS, Dakar or an XR400 etc, nipples could be good idea
Although, high temperature grease may be adequate.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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