I have just fitted 4 T Motors 3515-15 400kv to my quadcopter but the motors all keep stuttering slightly when running? Im not sure if they are going to full power either! I am using 30 amp OPTO ESC's with 4s lipo on Naza. Before I was using 980kv Sunnysky motors with no problems on the same Esc's? Stuck as to what to try to fix the problem?
Does anybody know what could be causing this? Any help greatly appreciated!