I have been flying the ZEN90 with a YS120, Hatori flex header and Hatori Pipe. I use a 16x8 APC. Retracts are not original, competition retracts with trailing shims to keep the struts leaning forward, titanium struts and lite wheels. I use a 20 oz tank though I only fill 3/4 for a 10min flight. Use good servos.

I simply love that plane. Ballistic performance with excellent low speed characteristics, never drops a wing; flys straight as an arrow in any wind. Stunning axial rolls and knife edge without any mixing; at least I think no mixing as I fly the sticks even with a good radio.

Vim