Pylanton,

Any .40 two-stroke engine is strong enough for this bird.
The YS.53FZ is no longer in production, but it was tested to spin a 12x6, and 12x7 APC props, faster than most muffler equipped, .60 two-strokes.

Supercharging makes it that powerful, but it was tested with 30% nitro, liquid gold heli fuel.

The web page (in the UK), where I saw this engine review can no longer be accessed, for some reason.

It overheats with anything less than 20% nitro and needs this expensive fuel to run properly.

If you can find a NIB, or a very good used unit, it will fly your 'Stick like a bat out of hell...