Originally Posted by
BentKa
As long as you have 3mm mounting points for the motor bracket is should fit as the 550 size motor is only longer than a 540 size.
But I highly recommend not using a 550 size motor in the XB4.
550 size motor is used for the much heavier and beefier Short Course trucks for a reason.
Bent
What will be the bad thing ? Higher consumption on batteries? less torque?