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Can the front disk setup from the CB450 be installed on the CL450?
Not without changing the forks/fender, etc.
Also can you install the crank, rods and pistons from a CB500T in the Cl450 engine to make it a 500?
No, don't think so.....as far as I know. I believe the crank bearings are different, and won't fit in the 450 crankcases.