Alright, it’s only 5 minutes thanks to the wonders of time-lapse video, but here’s an interesting video of a mechanic replacing a crankshaft in a Honda CB300.
Honda’s currently got a recall going on the crankshafts in their 300cc engines, so this mechanic (who works at MR Motorcycle and Marine) has gotten pretty proficient at it.
I originally saw this video on Reddit.