501x Question

[MITamiya]

Gents, just bought a 501X that came with a front one-way. I have never used a front one-way before. I put a Mamba Max 6900 in the car and tested it out today. When I hit the throttle, the front wheels spin hard but the rears hardly move. Is this a function of the one-way not being adjusted/broken, or is this something with the clutch? Any help would be appreciated.
Thanks,
Todd