Then you will be fine. I have the same motor as you do and run on 6s rhino 4900's in a 12 pound / 5500 gram Emaxx. When I first got it, the motor would get to about 145* and now I cannot get it passed 125*. how fast is your buggy going? try the timing and see if it cools it a bit...
Maxx - FLM, MMM, CD Med.36x706s
Raja - FLM Ext. MM, 1512, 4s
SC8ight - MMM, 1520, 6s
D8T - MMM 1717 6s