Originally Posted by MantisWorx

go with the 4000, the 4600 is just simply too much, the trend right now is lower KV /bigger pinion. i have run both and prefer the 4000. this motor is soooooo smooth! i had the novak 4.5 before and it is a good motor to but pales in comparison to the pro4, runs cooler and you dont have to worry about the bearing siezing up (it will eventually go, just a matter of time). on the video i posted i am geared 14/60 , i normally run 15/60 but my 15 came loose and wore the teeth funny. after a 10min main my temps were 155! The pro4 is the best motor i have ever purchased, its that good