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I'm putting my Z50 k2 engine back together and I notice the oil pump drive gear is asymmetric, which I didn't notice when I took it apart. I have all new cam chain and sprocket pieces. What is the correct way it goes back in?

I need to replace the main bearings on my Z50 K1 as I found some radial play in both after splitting the cases during a restoration. They both came out still attached to the crank. I'll be taking the crank to a local shop since I don't have the tools to remove either the bearings or the cam...