21.5 brushless motor - gritty issues

[Simion Wabs]

Just purchased TRX ET-21.5Tnew off the bay.

Recieved it after only 5 days. Brilliant.

However, when manually spinning the motor by hand, the action is very gritty. I have an EZrun 13T than spins freely by hand. I have had a GT10.5 that was very gritty when spinning by hand also.

Once I apply full throttle, the motor spins up nicely and the noise is quite quiet (not as quiet as the EZrun). At low rpm (not attached in car) the motor is rough again.

Could the motor be out of alignment (end bell to end bell)? Could the bearings be dry?

Any advice on what to check would be appreciated

Cheers

Si