XAircraft Different torque from motors, problem or normal? (X650-V8)

[Sebas600]

Hello,<br><br>I've put together my X650 V8 with the new V2 hardware.<br>but when testing my engines I found that two engines of the eight could be easily stopped by hand at full throttle.<br>the other six are unstoppable by hand while these two stop at light squeeze an start jittering like when you thane on cable of the motor. when released they resume spinning and again appear normal.<br><br>What could be wrong? are the esc's broke? is this normal?<br><br>has anyone had this problem, or is this no problem... seem to me like it's going to be when taking it out...<br><br><br>