I just went out and looked at the cam bearings I replaced from my 2 previous intake roller failures. The 2 big roller bearings i have are both marked "Japan" and came in a KTM box. They are also sealed on both sides. The smaller needle bearings are both marked "Germany". I think a PO must have replaced that bearing in the past? Maybe it's just the pic but that intake roller looks scored? Both of mine were locked up and ground up themselves and the intake lobe of the camshaft. Good call, in my book, on going ahead and replacing those rollers. Are you going to rebuild the water pump as well?