Two guys and a bike

[G-Man]

Here are some CB77 pistons and a CA77 piston in the middle for comparison.







G

If the cylinder studs aren't damaged, there's really no reason to unscrew them and there's a chance that they will break. There is a certain satisfaction to complete disassembly though and we understand that...

If you search CA77 pistons you'll see an obvious difference in the design of the crown.