Just like a Zippo Lighter: You can rebuild it ! That's the beauty of the early Harley-Davidson engine design which has "serviceable" parts. Races that can be honed oversize and fitted with new oversize bearing rollers, bushings that can be replaced. Cylinders with enough material to bore for oversize pistons. The motors can be put back to service and run again and again. We honed the original rod races (round again) and fitted +.001 rod rollers. His crank pin was still good. The original H-D crank pin - not pitted, still measured standard size. We fitted new wrist pin bushings, reamed, then precision honed for a light press pin fit at 70 degrees(temp).