Use the spinner that looks right on the plane. Doesn't have much to do with the engine.

I have a 2" spinner on my Venus with a 55AX, I had a 2.25 inch spinner on a 46AX on my trainer, and I have a 2.5 inch spinner on my 120AX and a 2.75 inch spinner on my 110FZ.

Sometimes you have to widen the slots to get the prop to fit, or you can get spinners with larger cuts. I got the "120 cut" for my 110 four stroke which fits larger props.