I’ve been investigating the use of Mikuni Carbs on ‘55 - ‘69 Models (more specifically for a ‘57 R60).
Rocky Point Website list Carbs for 600 cc bikes, the /5, /6 and Slash 7. Note says “Not for /2”. Don’t know what that implies, but will find out.

What I am after here, is information from folks that actually bought and tuned Mikunis on Pre ‘70 bikes. From fitment to starting to running.

First hand experience if you care to share.

Thanks in advance.