I am going to get the space walker II from horizon but I think I want to get a four stroke. The specs call for a 41 size 2 stroke and a 40-82 4 stroke. It seems like a large range on the 4 stroke. This is my second plane and i don't want to much engine then i can handle. What would be a good 4 stroke. And what are the advantages of a 4 stroke over a 2 stroke.