Quick update as my friend came by yesterday and we installed the motor into the frame and the build is moving along nicely now. I painted and shot urethane clear coat over both the tank and side covers and after a few fits and starts they came out nice. They are both a metal flake paint in the black and emerald green colours and show well in the sun.
Nothing a little OCD can't fix is my motto.
I purchase a used aftermarket four into two exhaust to replace the four into one that came on the bike. It won't fit on the left side without detabbing the frame of the side stand mount. Not an option for my friend, as he wants to retain the side stand. The seller did make me aware of the potential issue since he also had it on his later CB550 frame too; yet I had hoped the CB500 frame having the side stand tab in a different location would avoid the issue.
So I have some exhaust garage art for the next little while.
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