I recently bought a Backdraft 3.5 nitro. I'm curious because if I roll it forwards, it rolls freely. All wheels roll in the same direction. When I roll it backwards it locks up like the brakes are engaged. Someone suggested to me that it's stuck in 2nd gear? Is there a way to free it up? Also it has a roto start on it, and when I turn it over the wheels spin? Thanks for any info.