I don't know what ESC you have or what caps it uses, but good caps are rated to 105c (225f), so if it uses good caps it wouldn't be overly worrying to me in the short term with the ESCs and caps I use, but caps do have a finite lifespan and the warmer they run the shorter that is, so long term I do try to keep all my electrics under 60c (140f).
Caps have little mass and heat up fast with more power or worse batteries, so it shows you don't have much overhead for either left. It is natural for the inside motor, ESC, and battery of a twin to heat up more than the outside, if you are running ovals or otherwise primarily turning in one direction more is it the cap on the ESC supplying the motor on the inside of the more popular turn that is getting hotter? Do a run of figure 8s so you know you have been driving evenly and check temps again. If you still have one being much hotter than the other, then I would suspect that the battery supplying the one with the hot caps has a higher internal resistance, either being batter from the factory, or may be on it's way out.
You can lower cap temperature by shortening battery/ESC leads if you have room, or adding more caps, as well as by propping down and using more capable batteries.
Paul Upton-Taylor, Greased Weasel Racing.
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