I am looking to buy an asp 4 stroke engine, But i am not sure what size to go with. I want something that will be close in power to the fx or tt pro 46. I am not looking for top end speed but more pulling power. How does a 65 4stroke compare to the 46 2 strokes? Is there a basic rule to follow to get and equilvant 4 stroke to a 2 stroke? i saw on a site that the magnum 46 2 stroke has better top end speed but the 4 stroke 52 has better pulling power or vertical. I thought about getting the asp 80 4 stroke but if it going to weight a ton more than the 46 2 stroke and produce a alot more power then i dont really want that. I am looking to put it on a 5 to 6lbs plane and want to get good vertical performance and hovering with it and enough power to pull out of a hover. I chose asp because the price is so much better. I heard that they are also made in the magnum factory also.