It's easiest with the Pizzaz to balance it upside down. Either way will work equally well. Check then instruction booklet and make sure you are balancing the plane at the right location. I can't remebber where i balanced the one I had, but I do recall that the best balance point for all around flying was about 1/2" rearward of the kit suggested location.

By the way, the Saito 50 is on the lower side of the suggested engine sizes. Being smaller than suggested, it may be much lighter that most of the other engines noted for this plane.

Best of luck and good flying.

Silversurfer