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I've broken in and ran 3 gallons of fuel through my 2.5R revo without ever having a temp gun to use. I tune by performance and what the engine is telling me. I just today put a gun on it after 1 tank with best performance tune and no hanging after a wide open pass and plenty of smoke. With it pushing mid 90s outside my engine temp was 287 and that was after richening it a little to get some heat off the head. And from the drop of water testing I've been doing the whole time that is the temp this engine runs best at. Same temp outside with the .26 max one tank it reads 220. So i do believe some engines just run hotter than others so the 250-260 range is not necessarily the correct range for all engines and I'm sticking to my way of tuning which is best for me. Tune for performance and not temps but do use temps as a guideline.
---------- Post added at 4:17 PM ---------- Previous post was at 4:13 PM ----------
Also i just broke the 2.5R down for cleaning and re sealing and the piston looked great! No pitting or discoloration. Still has good pinch as well. So soaked it all in some 33% and put her back together and sealed the carb neck and backplate good with red rtv. I was expecting some signs of high heat but found none. So I'm fine with her running in the 280s.