Nope.
I removed the cables and left the servo motor in place.
Been running that way for thousands of miles.
If I ever wanted, or needed to re-install the stock system, I'm ready to go.
Removing the servo will only save you about 2 pounds of weight.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs