Castle Creations motor and ESC combo recommendations for the Arrma Talion.

Monster X w/1515-2200kv - Stock gearing (13/50) on 6s = ~50MPH
Monster X 8s w/1520-1650kv - 15 pinion/50 spur on 8s = ~57MPH
Monster X 8s w/1717-1650kv - 17 pinion/50 spur on 8s = ~65MPH

Note: All speed estimates are with stock tire diameter, high quality batteries and appropriately sized battery connectors.
Always monitor ESC, motor and battery temperatures on new setups or when changing gearing or batteries.