Are there pilot weight limits for the Rutan Vari Eze?
According to the Owner's manual, 


  The air plane can structurally accommodate pilots or passengers weighing up to 250 lbs.


Of course, this is subject to the maximum allowable takeoff weight.

The manual also gives the forward and aft cg limits (in page 30). In case of very light pilots, the aft cg limit may be exceeded and it may be required to carry ballast for bringing the cg within limits.