That was a Honda ST1300 and is missing significant amount of metal on the right side of each spline. But, methinks I oughta scare ya some more.... we don't know the hardness, and the idea is it can all be prevented. The real ugly photo here is an ST1100 with 91,000 miles and in addition to being totally neglected, it was missing a thrust/spacer washer so wore off more on one end. The others are mileages somewhere in between, suspected again of not using moly.