You may have some air in the hydraulic system. Try bleeding it.
The bleeder screw is on top of the bell housing. It helps to remove the air intake tube for access. Bleeding is similar to bleeding brakes. Have an assistant pump the pedal several times and hold the pedal down while you open the bleeder. Close the bleeder immediately after the fluid spurt, and then repeat a few times. I'm not sure, but I think it takes an 8mm wrench.
