Don't I need the inByte option
You don't need to read it into a variable if you're not using it anywhere else, you could just put the "Serial.read" in the "switch".
(I was only slightly joking, hence the wink)
What do you mean by ex-servo?
I mean it used to be a servo, but it isn't anymore.
It is a geared DC motor with a convenient single wire direction and possible speed control.
I tried 255, still nothing.
Check your wiring.
Maybe add some debug prints to make sure your program is going where you think it is.