You might get by with a fan on the esc... but it would be good to see if a setup change could help too.
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wether the gearing is 13/90 or 17/90 the esc temps are the same
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How much does the speed and power change? If the speeds seem similar then I would say gear down even more and see what happens.
Are you running in grass at all?
Jammin CRT MM/Neu 1515 1700kv
Losi 8IGHT MM/Neu 1512 1900kv
Kyosho 777
T4 MM 5700
B4 LRP
XX4 MM 7700
old losi xxcr, MM4600 4s lipo 70mph+