Thanks. I definitely lack the experience of making things work which is why I hesitate after seeing my plane with a Saito 125, which probably has a shallow pitched prop and a super aft CG. I have no idea how much things will change with CG and prop selection. I have seen a video of the plane with the YS, and it totally blows me away! I just found out it's with 20% nitro, so it shouldn't perform too much differently if I run 15%.

So another question: other than the new FSa series by OS, do all four strokes have a port on the back plate? What is this for? Can it be branched off and used for a perry pump?