There have been a couple of recent threads in this subject. Obviously individual experiences will vary according to the climate and yours is HOT. Here are a few ideas to chew on:
I don't have that problem in the UK climate and I have not had the hot leg syndrome some seem to complain about.
I think I would want to make sure everything was right with the bike first. If you have a buddy riding a big K who has the same problem, then that leans towards a common issue with the bike in your climate.
Do you get the hot legs continuously at cruising speeds or after cruising and when slowed or stopped? If the latter, then modifying the electric fan cooling properties could help. When you are on a long cruise in this hot weather getting hot legs, where is the temperature gauge reading?
The K's throw out a lot of heat and the hot air has to get out somewhere. That should be down through the underbelly or out of the side vents in the plastics. There are those slots at the bottom of the side panels, but I would have thought the path of least resistance is the first two.
Check the black/gray heatshield near the shifter is actually fitted.
Some years ago I played with fine adjusting the ignition timing by +- a degree. Sorry I cannot remember which way it went but one way did seem to run the engine cooler without much noticeable drop in power. In fact idle seemed a lot smoother.
I am not a fan of aftermarket parts, but the K CAT is like a huge heat sink sat right near your legs. Many have reported a much cooler (and lighter) muffler system when they swapped the oem for aftermarket.
Changing clothing seems like a last resort to improve the problem. I think you would be looking for pants with a heat reflecting layer sewn in just below the outer layer. Whatever is used, needs to keep you warm in Winter.
Have you tried wrapping half a dozen of those velcro wine cooler wraps up your legs and going up a size in riding pants.
Or there is the refrigeration approach - plastic tubes sewn inside the pants and jackets with quick disconnects plugging into a compressed gas or chilled water refrigeration unit.
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