well,,,,are we hearing that they are blowing, doo has had sealed bearings now for many years and does not seem to be an issue,,,,unless I am not hearing about it.
I belive overheating the 800r engine can cause the sealed bearing to loose some grease if the seals are already well worn. Keeping the primary clutch cool and not overheating the engine should result in those sealed bearings lasting at least 8-10k for trail riders. Also should check crank run-out every season to see where that is at.
