I am currently building a top-Flite P-51D that I bought off this forum (60 size not the giant).

I am wondering which 120 size 4 stroke engine to use. I only have experience with 2 strokes, the biggest of which is a OS .46 FX-H heli motor.

I am leaning toward a OS 120 Surpass, but don't know if I should get the pumper or not. I have never used one of these and don't know if they are REALLY necessary, or just complicate things..

Also, the supercharged YS 120 caught my eye, but I have never owned a YS before.

So... what do you guys recommend, since I value your input .

Thanks.