Sumo help
So i bought the sumo truggy and i love the thing, played with it a couple days and i felt i needed more power, so i grabbed the 180 upgraded motor and the heatsink, and had my redcat dealer order me the rechargable batteries, when i got home i put the new motor in and put it all back together, i went to run it and the second i hit the throttle, the little guy flies backwards, i already checked the throttle reverse, i switched it but it makes the motor run slower becuase with throttle reverse on the motor runs at the speed it should in reverse, when i back up its a speed demon and runs at the speed it should going forward lol can anyone help me solve this? thanks guys!