Hi,

I fly mine with a Saito 72; the power is awesome it will hover at half throttle with 20% nitro and it is not as finicky as the YS. Don't get me wrong the YS63 will produce awesome power in this model but the Saito or OS 70's will be much less finicky. If you are worried about power you could always buy a Saito 82, this engine will give unlimited vertical and on cheaper fuel.

Cheers,
Sam.