My bike had a puncture in the left radiator tank courtesy of the previous owner.
He had sealed with JB Weld, but it didn't hold, so it started leaking coolant slowly.
So my bike temps started gradually rising, until one summer they reached 240 Deg F. while traveling down the freeway.
So when I had the bike down for a refurb, I removed the radiators and had the left radiator repaired by a shop that does aluminum radiator fabrication/repair.
I then made sure all hose clamps were nice and tight (esp. the left radiator clamp which is know to loosen) and filled the system with Engine Ice pre-mix.
I also noticed that my left fan bearings were starting to squeak, so I also replaced both radiator fans.
Now when I'm cruising down the freeway, the temps average around 182 Deg F. (or less in the spring and fall) and in town, around 207-210 Deg F. while moving and no more than 229 Deg F. at most.