Ok Mike, I'll play the its not a catastrophe game, seems like fun. Even though at this point I don't have time, and/or money to tear into it and replace all the parts again, that doesn't mean we can't turn this into a learning expierence and have a running CRF at the end.
Oil pump is a good idea, I seriously doubt its aluminum too, engine must come out of frame.
Shim wiggling out, I doubt, it still starts and runs, I hear no abnormal noises.
Timing chain? Although there is no slap to be heard.
we will work on making WR raceable (hardly a big task) and then play with CRF later.