If the originals have plastic-type cages like on my '01 748R, I'd replace them with an aftermarket bearing that has metal cages.
My mickey-mouse plastic OEM one disintegrated at 90-100mph on the Park Straight earlier this year and minced a lot more than the sprocket......
To say I was flabbergasted at the build material I found in my belly pan was an understatement.
You have been warned
