The 6XL will get hot quickly on 4S. There's really not much you can do about it other than gear down as much as possible or buy a new motor.
Also, the 3200kV Neu 1512 is really too high a kv for 4S IMO. I wouldn't go any higher than a 1512/1Y at 2750kv. However, I think a 1515/1Y is probably a better choice.
arrrgghh!!!tanks for the info lol my motor is brand newbut i want a top speed of around 45mph a 2700kv should be a great choice geared 20/68?????
should not overheating????my 2770 feigao get hot...the 2700kv neu does not do the same thing???