Try making a new Biped rig that matches your current Bones rig...

Unlink all the Bones rig into individual bones.

Link each Bone to its associated Biped part.

Apply motion to biped...

I'd at least try it with an arm or leg just to see how it works before doing the whole thing. Seems to me that it should work.

Thanks for the tip as it could be an option but i was hoping to have the max bones rig independant without CS biped interaction... I feel the CS bipeds have their limitations... I'm guessing the max bones rig will only mimic the limitations if linked to biped (if it successfully worked with a full max bones rig).

I'm getting the impression MC cannot be applied directly to max bones & if so i am wondering if Maya would support it... Last resort as i am much more aquainted with Max. Might be worth posting in their forum though??...