DB is right on the money. I would also say try the same sizes in APC props as well. The APC's I feel may work a little better on that motor IMHO. It never hurts to try different props untill you find a combination that works for you. I have about 30 some different props in various sizes. And I only fly 40 to 60 2 strokes and 80 and 120 4 strokers.

Mark Shuman