Hi ,converting a 50cc 4stroke china quad (not a mini,but mid size) to electric .Bought the 48 volt 3k liquid cooled bldc motor,thinking the motor had oil in it cooling it?Got the motor came with no info,does it have a internal pump? do I use a external pump,know of the thermal gravity way but want to cool it better using external pump have some old dirt bike rads.Any installation post?macanicaly inclined just need info.I am 58 years old,this is going to go with me into retirement, will be my mode of transport where I live LOL