When I pulled my front drive shaft out to pull out my tranny, the u joints were so seize that even hitting them with a hammer they hardly move, so basicly I got it in time or it would have eventually blow the diff bearing or possibly break the cover, I actually have a little bit of play in the pinion bearing but leaving it as is for now,

so I ordered aftermarket greasable u joints for 25$

Make sure to check it regularly or it will cost you possibly a front diff

When I pulled the cap off the u joints, it was full of rust not sure what kind of cheap grease they put in there or if they even put any it was super dry and rusty

Bike has 600 km