I replaced my bronze drive gear and the bushing. There is about 50 miles on this, and you can see that the bushing is already scored. The underside of the driver gear is scored as well, I can feel it when I run my finger nail across it. When I installed the new gear, it was well lubed with oil, and I used assembly grease on the contact area between the gear and bushing.

Thing is, my old one was like this too, old bushing and gear. Not long after the engine was together I found it, and the wear seemed significant, so I installed a very thin washer between the two, and all was well from then on.

Should this be wearing like this? Seems that if I have two doing the same thing it is normal, but I wouldn't think this would happen.