why not start even lower with timing? somewhere guaranteed to almost be too low.
and why not gear lower too.
then you can make sure you are making all of your rpms and that temps are in check without having to go 65mph.
then you can add more gearing and check temps again. then add timing if your temps are in check and you need more power in the midrange.
or don’t and just make a thread asking where to set your timing and then just trivially set it somewhere for fun and then move on to another bike when this one doesn’t perform :)